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nasty-shy [4]
3 years ago
7

Two numbers, x and y, when added together equal 9 and equal -5 when subtracted.

Mathematics
1 answer:
Sedaia [141]3 years ago
6 0

Answer:

x=2 and y=7

Step-by-step explanation:

Let x and be the unknown numbers.

By the condition given in the question the first equation is

x+y=9

And the second equation is

x-y=-5

By solving the first and second equations,we get the answer as

x=2 and y=7

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Simplify 3(у- 1) +7 completely.<br> А. Зу+6<br> В. Зу+ 4<br> С. 3y+10<br> D. Зу- 3
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Answer:

B. 3y + 4

Step-by-step explanation:

Step 1:

3 (y - 1) + 7

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Step-by-step explanation:

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Dion meets a friend for lunch at 12:45 p.m. They spend 1 hour 25 minutes eating lunch. What time do they finish eating lunch? 1:
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Step-by-step explanation:

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3 years ago
Calculate the average rate of change over the interval 2
Morgarella [4.7K]

Answer:

Average rate of change over the interval 2<= x <= 5:

y = 3x + 5:        3

y = 3x^2 + 1:     21

y = 3^x:             78

<u />

Step-by-step explanation:

2<= x <= 5

Average rate of change over the interval 2<= x <= 5:

<u>y = 3x + 5</u>

y(5) = 3(5) + 5 = 20

y(2) = 3(2) + 5 = 11

Average rate of change = (20 - 11)/(5-2) = 9/3 = <u>3</u>

<u />

<u>y = 3x^2 + 1</u>

y(5) = 3(5^2) + 1 = 75 + 1 = 76

y(2) = 3(2^2) + 1= 13

Average rate of change = (76 - 13)/(5-2) = 63/3 = <u>21</u>

<u />

<u>y = 3^x</u>

y(5) = 3^5 = 243

y(2) = 3^2 =9

Average rate of change = (243-9)/(5-2) = 234/3 =<u> 78</u>

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3 years ago
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