If x=7 and y=-3

12-5xy +9x2y + 15-2y2

Answers

Answer 1

Answer: Just plug in x = 7 and y = -3 in place of x and y, respectively

$12-5xy +9x^2y + 15-2y^2\n\n12-5(7)(-3) +9(7)^2(-3) + 15-2(-3)^2\n\n12 - (-105) + (-1323) + 15 -18\n\n12 + 105 - 1323 + 15 - 18 = \boxed{-1209}$

Your answer is -1209

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Round 1.069 to the nearest tenth

Answers

$1.07$
.................

1.069 to the nearest 10th is 1.070.

What is the best estimate for the sum of 3/8 and 1/12

Answers

I would round the 8 in 3/8 to ten, along with roundin the 12 in 1/12 to 10 as well. Now you would have 3/10 + 1/10, = 4/10 or 2/5 simplified. Hope this helps, (as this would be my estimate!)

The best estimate would be 11/24, actually that is the exact...

Sophia exchanged 1000 U.S. dollars for the South African currency, which is called the rand. The exchange rate was 7.15 rand to $1. How many south african rand did sophia get? please explain how you know.Part B
Sophia spent 6,274 rand on her trip. The exchange rate was 1 rand to $0.14. How many US dollars did Sophia get? please support your answer.
thank you so much!!!

Answers

Part a:-

7.15 rands = 1 dollar

So we are going to MULTIPLY to find out how many rands there are going to be.

1000 × 7.15 = 7150

So, 7150 rands is your answer.

Part b:-

To do this first we will DIVIDE.

6274 ÷ 7.15 ≈ 877.482.......

So, 6274 rands is ABOUT $878.

Par a:- 7150 rands

Part b:- about $878.

Hope I helped ya!!!!!

How do you simplify 3:9:15:24

Answers

All of those numbers have a common factor, which is 3. So you divide all of their values by 3.

3:9:15:24
=1:3:5:8

Because the values cannot be divided anymore, this ratio is in it's simplest form.

I don't get this question help me