can you help me out I’ll mark brain list .

Answer:

- 4

Step-by-step explanation:

Tan(45°) - 10 * cos (60°) =     - 4

Answer:

x = 1/2 , x = -1/2

Step-by-step explanation:

Given equation;

169x² - 42.25

Find:

Solution of equation using square root

Computation:

169x² - 42.25

We know that 13² = 169 and 6.5² = 42.25

So,

[13x]² - [6.5]²

a² - b² = (a + b)(a - b)

So,

[13x]² - [6.5]² = [13x + 6.5][13x - 6.5]

So,

13x + 6.5 = 0 , 13x - 6.5 = 0

x = 6.5 / 13 , x = -6.5 / 13

x = 1/2 , x = -1/2

Answer:

[7-2x+5y-(x-y) -[5x+3y-7]

= 7-2x+5y-x+y-5x-3y+7

=7+7-2x-x-5x+5y+y-3y

=14-8x+3y

=-8x+3y+14

Step-by-step explanation:

Answer:

The answer is 14!

Step-by-step explanation:

Answer:-14.72

Step-by-step explanation:

Answer:

The answer is negative 14.72

Step-by-step explanation:

this is because if you multiply negative 4.6 and 3.2

Notice how both lines intersect at 18 days. That means that at that point in time, both lines represent a value that is exactly the same.

Therefore, Frank and Erica will have the same to sell on Day 18

(Option J)

Given:

The equation of parallel line is \(y=-\dfrac{1}{4}x+5\).

Required line passes through (2,-3).

To find:

The equation of line.

Solution:

We have,

\(y=-\dfrac{1}{4}x+5\)

On comparing this equation with \(y=mx+b\), where m is slope, we get

\(m=-\dfrac{1}{4}\)

Slope of two parallel lines are always same. So, slope of required line is \(m=-\dfrac{1}{4}\).

The required line passes through the point (2,-3) having slope \(m=-\dfrac{1}{4}\), so the equation of line is

\(y-y_1=m(x-x_1)\)

\(y-(-3)=-\dfrac{1}{4}(x-2)\)

\(y+3=-\dfrac{1}{4}(x)-\dfrac{1}{4}(-2)\)

\(y+3=-\dfrac{1}{4}(x)+\dfrac{1}{2}\)

Subtracting 3 from both sides, we get

\(y=-\dfrac{1}{4}(x)+\dfrac{1}{2}-3\)

\(y=-\dfrac{1}{4}(x)+\dfrac{1-6}{2}\)

\(y=-\dfrac{1}{4}(x)-\dfrac{5}{2}\)

Therefore, the equation of required line is \(y=-\dfrac{1}{4}(x)-\dfrac{5}{2}\).

The floor that Ramon lives on, given the address that Ramon gave his friend in Johannesburg, is Floor 18.

Ramon's Flat number, given the address, is Flat 34.

In South Africa, there is a way to write the floor that a person stays on and the flat number, in the address that they give to you. The format is such that the first two numbers would represent the floor number. This means that an address of 0208 would means that the floor number is the 2nd floor.

The second two numbers would then be the flat number of the person which means that an address of 0208 would have a flat number of 08.

Ramon's address of 1834 Norman Heights Hillbrow Johannesburg would then be Floor 18 and Flat 34.

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Answer:

To find 40% of a number, you can multiply the number by 0.4 or divide it by 2.5.

Using this method, we get:

40% of 100 is 40 (100 x 0.4 or 100 ÷ 2.5)

40% of 110 is 44 (110 x 0.4 or 110 ÷ 2.5)

40% of 140 is 56 (140 x 0.4 or 140 ÷ 2.5)

40% of 120 is 48 (120 x 0.4 or 120 ÷ 2.5)

Therefore, 40% of 100 is 40, 40% of 110 is 44, 40% of 140 is 56, and 40% of 120 is 48.

The graph of the inequality is attached below.

What is inequality?

In mathematics, inequalities describe the relationship between two values that are not equal. Equal means to be equal, not. The "not equal symbol (≠)" is typically used to indicate that two values are not equal. But different inequalities are used to compare the values to determine whether they are less than or greater than.

Consider, the given inequality

      K/2 - 20 ≥ -18

Add 20 on both sides,

K/2 - 20 + 20 ≥ -18 + 20

               K/2 ≥ 2

Multiply both sides by 2,

        K/2 x 2 ≥ 2 x 2

                  K ≥ 4

Now to graph the inequality.

The graph of the inequality is attached below.

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Answer:B

Step-by-step explanation:

Because, if the width of the frame is x inches this is the total of this frame and artwork. so the answer is B.

Do you choose best?

Answer:

1,800 lbs of sand

900 lbs of gravel

600 lbs of cement

Step-by-step explanation: 11*300=3,300. 300*6=1,800, 300*3=900, and 300*2=600. This is correct because if you add 1,800+900+600 you get 3,300.

Standard Deviation for given set of data is 0.25634797778466.

What is standard deviation?

Given that,

Sample size :12.3,11.9,12.5,12.1,12.6,11.9,12.2,12.1

Count, N: 8

Sum, submission x: 97.6

Mean, x: 12.2

Variance, s2:  0.065714285714286

s^2 = Σ(xi - x)^2/N - 1

= (12.3 - 12.2)2 + ... + (12.1 - 12.2)^2/8 - 1

= 0.46/7

=  0.065714285714286

s =  √0.065714285714286

=  0.25634797778466

Standard Deviation for given set of data is 0.25634797778466.

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Answer:

8 + 30 ÷ 2 + 4  = 27

8 + 30 ÷ (2 + 4 ) = 13

(8 + 30) ÷ 2 + 4  = 23

Step-by-step explanation:

Answer:

6:40

Step-by-step explanation:

6 blue marbles

8 green marbles

9 red marbles

17 yellow marbles

6+8+9+17= 40.

40 is the total amount of marbles.

There are 6 blue marbles.

Comparing the amount of 6 to 40 would be 6:40

Answer:

95% confidensce interval of the mean (two-tail) =  [132.2, 139.2]

Step-by-step explanation:

Given:

N = size of sample = 61

m = sample mean = 135.7

s = sample standard deviation 13.7

Need 95% confidence interval

Solution.

alpha (95% confidence interval) = 0.05

(1-alpha/2) = 0.975   [two sided]

Equation for confidence interval of the mean

= m +/- t(1-alpha/2,N-1) * s / sqrt(N)

= 135.7 +/- 2.0003 * 13.7 / sqrt(60)

= [132.16, 139.24]

Answer: Venus

Step-by-step explanation:

Answer:

Step-by-step explanation:

Given diameters of planets:

Compared, we see the smallest value belongs to Mercury

The second smallest planet is Mars

Answer:

c of what im sure about

Step-by-step explanation:

With the use of formula, the amount of Iodine-125 that would remain in the tumor after 60 days is 0.45 grams

First analyze the problem and represent them in exponential function. The decay rate is different from increase rate with minus and plus sign.

Given that a tumor is injected with 0.9 grams of Iodine-125, which has a decay rate of 1.15% per day. Let

An exponential model representing the amount of Iodine-125 remaining in the tumor after t days will be

A = I( 1 - R%)^t

Let us use the formula to find the amount of Iodine-125 that would remain in the tumor after 60 days by substituting all the given parameters into the formula

A = 0.9 ( 1 - 1.15/100)^60

A = 0.9 ( 1 - 0.0115)^60

A = 0.9 ( 0.9885)^60

A = 0.9 x 0.4995

A = 0.45 grams

Therefore, the amount of Iodine-125 that would remain in the tumor after 60 days is 0.45 grams

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Using the concept of word problems and quadratic equation it will take 1 year until the sum of square of their ages be 45.

Word problems are mathematical problems that are delivered in ordinary words, instead of mathematical symbols.

Part of the problem with dealing with word problems that they first need to be translated into mathematical equations, and then the equations need to be solved.In this problem;

let x represent the number of years from now when the sum of square of their respective age will be

45.(x + 2)² + (x + 5)² = 45

Expanding the brackets;

x² + 4x + 4 + x² + 10x + 25 = 45

2x² + 14x + 29 = 45

2x² + 14x + 29 - 45 = 0

2x² + 14x - 16 = 0

Solving the quadratic equation for x;

x = 1, x = -8

Taking the positive value, the value of x is 1

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Using the percentages formula, we conclude that the percentage increase in life preserves is 40%.

So, the percentage increase in life preserves:

Now, substitute the values in the formula as follows:

Therefore, using the percentages formula, we conclude that the percentage increase in life preserves is 40%.

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Answer:

To calculate 2 3/4 of 500 grams, follow these steps:

1. Convert the mixed number to an improper fraction:

2 3/4 = (2 x 4 + 3)/4 = 11/4

2. Multiply the improper fraction by 500:

11/4 x 500 = (11 x 500)/4 = 2,750/4

3. Simplify the fraction by dividing the numerator and denominator by their greatest common factor, which is 2:

2,750/4 = (2 x 1,375)/(2 x 2) = 1,375/2

Therefore, 2 3/4 of 500 grams is equal to 1,375/2 grams or 687.5 grams.

Step-by-step explanation:

So on solving the provided question, we can say that  y= |x| makes a starlight line, this equation is a linear function.

Two distinct but related concepts are referred to as linear functions in mathematics. A polynomial function of degree 0 or 1 is a linear function in calculus and related subjects if its graph is a straight line. Any function that depicts a straight line on a coordinate plane is said to be linear. For instance, y = 3x - 2 is a linear function since it depicts a straight line on the coordinate plane. f(x) = 3x - 2 can be used to represent the function since f(x) can be linked to y.

equation represents a linear function is that polynomial function of degree 0 or 1 is a linear function in calculus and related subjects if its graph is a straight line.

so, here  y= |x| makes a starlight line, this equation is a linear function.

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Using the cosine ratio, the distance between Dimitri and Sarah is calculated as approximately 12.4 m.

The cosine ratio is a trigonometric ratio that represents the ratio of the length of the adjacent side to the length of the hypotenuse in a right triangle. It is calculated by dividing the length of the adjacent side by the length of the hypotenuse.

Using the cosine ratio, we have:

Reference angle (∅) = 72 degrees

Hypotenuse length = 40 m

Adjacent length = distance between Dimitri and Sarah = x

Plug in the values:

cos 72 = x/40

x = cos 72 * 40

x ≈ 12.4 [to one decimal place]

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Answer:

0.28

Step-by-step explanation:

The z score shows the number of standard deviations by which the raw score is above or below the mean. If the raw score is above the mean then the z score is positive but if the raw score is less than the mean then the raw score is negative. The z score is given by:

\(z=\frac{x-\mu}{\sigma}\\ \\\mu=mean,\sigma=standard\ deviation,x=raw \ score\)

From the normal distribution table, the z score that corresponds to the bottom   60.94% (0.6094) = 0.28.

Let L be the number of hours worked on the lawn service and G be the number of hours worked on a gym.

Since he can work at most 20 hours and the total amount of hours worked is L+G, then:

Since Jonathan earns $10 for each hour working on lawn service and $8 for each hour working on the gym, the total amount of money that he earns is 10L+8G. Since he needs to earn at least $175, then:

These two inequalities make up the system that describes this situation.

Answer:

Y-intercept is (0, 100) and the X-intercept is (-250, 0)

Step-by-step explanation:

For the y-intercept the line from the origin does not move left or right and stays at 0 but it goes up by 100.

For the x-intercept the line does not go up and down but it goes to the left -250.

Answer:

she is charged 80 in interest for 4 years, the total she has to pay back is 480

Step-by-step explanation:

Answer:

Option B

Step-by-step explanation:

If the larger triangle (Preimage) is dilated by a scale factor 'k' to form the image triangle (small triangle),

Scale factor = \(\frac{\text{Length of one side of the image triangle}}{\text{Length of one side of the preimage}}\)

                 k = \(\frac{3}{2.4}\)

Therefore, Option B will be the correct option.