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3 years ago

Evaluate (y - 9) + (3 + x), when y = 15 and x = 5

Mathematics

1 answer:

svet-max [94.6K]3 years ago

5 0

Answer:

Step-by-step explanation:

It says 'Evaluate (y - 9) + (3 + x), when y = 15 and x = 5'.

So we'd put 15 in y's place. It'll look like this (15 - 9).

Then we'd put 5 in x's place. It'll look like this (3 + 5).

You subtract (15 - 9) which equals 6. And you'd add (3 +5) which equals 8. You add 6 + 8 together since those are your answer for the parentheses. Your final should be 14. Hopefully this helped!

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Which expression is not equivalent to (x + 4)(x – 3)?

Digiron [165]

Answer:

A) x² + 7x - 12 is NOT equivalent to the expression.

Step-by-step explanation:

1) expand by distributing terms.

${x }^{2} - 3x + 4(x - 3)$

2) Expand by distributing terms.

${x}^{2} - 3x + 4x - 12$

3) Collect like terms.

${x}^{2} + ( - 3x + 4x) - 12$

4) Simplify.

${x}^{2} + x - 12$

The second equation are equivalent to the equation. but the first equation is not equivalent to the main equation.

6 0

3 years ago

Simplify the expression -3/(-2/5)

Annette [7]

-3/(-2/5) = -3 * (5/-2)=15/2=7.5

5 0

3 years ago

Read 2 more answers

Katie has been withdrawing the same amount of money from her savings account every month. The table below shows the amount of mo

pochemuha

<h3>Answer: Choice B) $790</h3>

==============================================================

Explanation:

x = number of months

y = account balance

The first column of the table has (x,y) = (8,470) to mean that on month 8, her balance was $470

Then we have (10, 390) meaning x = 10 and y = 39. As x increased by 2, y dropped by 470-390 = 80 dollars. She withdrew $80 over the course of two months. Therefore, she is withdrawing 80/2 = 40 dollars a month. This is the slope value. It represents the rate of change. We could use the slope formula to find the same result.

Let m = -40 be the slope. It's negative to indicate the value of y goes down as x goes up, or vice versa.

With m = -40, x = 8 and y = 470, we can find the y intercept b like so

y = mx+b

470 = -40*8+b

470 = -320+b

470+320 = b

790 = b

b = 790 is the y intercept, and it represents the initial account balance before Katie started withdrawing money.

In other words, it represents the starting amount of money she has.

-------------------------

As a slight alternative, we could use the point slope form to find the y intercept

y - y1 = m(x - x1)

y - 470 = -40(x - 8)

y = -40(x-8) + 470

y = -40x + 320 + 470

y = -40x + 790

You don't have to use (x,y) = (8,470). You can use any column you want from the table of values. The value of m will be m = -40 the whole time however.

-------------------------

As a way to check to see if we have the correct equation, try plugging in various values of x to see if you get the proper y values as outputs as shown in the table.

For instance, if we tried x = 10, then,

y = -40x + 790

y = -40*10 + 790

y = -400+790

y = 390

That confirms column 2. I'll let you verify the other columns.

8 0

3 years ago

Estimate the tax on shoes that cost $68.50 when the sales tax rate is 8.25%.

Bond [772]

It would cost $74.15 for the shoes

8 0

4 years ago

60 points!!! Please answer immediately and the entire page please I will also give you five stars

Nataly_w [17]

Answer:

Step-by-step explanation:

9. Correct, D

-3Y + 9X <= 12

3Y - 9X => -12

3Y => -12 + 9X

Y => -4 + 3X

10. D

11. D

12. Correct, B

13. Correct, E

14. A

15. B

5 0

3 years ago

Evaluate (y - 9) + (3 + x), when y = 15 and x = 5​

Evaluate (y - 9) + (3 + x), when y = 15 and x = 5