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2 years ago

Chris can do 30 pushups in 60 seconds. How many pushups can he do in 360 seconds?

Mathematics

2 answers:

seropon [69]2 years ago

6 0

I’m going to say 180

Ilya [14]2 years ago

5 0

Answer:

Chris can do 180 pushups in 360 seconds

Step-by-step explanation:

Divide 360 by 60= 6

then multiply 30 by 6 = 180

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I'd really appreciate some help on these questions, I'm really struggling

nikklg [1K]

We can use linear combinations of the equations to eliminate variables.

3x - 4y = 1
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To eliminate y we'll make the linear combination of 3 times the first equation minus four times the second.

9x - 12y = 3
-8x + 12y = 4

Adding,
x = 7

We could solve for y directly but let's use another linear combination, twice the first plus three times the second:

2(3x - 4y) + 3(-2x + 3y)= 2(1)+3(1)

y = 5

Check: 3(7)-4(5)=1 good. -2(7)+3(5)=1 good.

Q18 Answer: (7,5)

y = -3x + 5
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4y +1(5x - 4y) = 4(-3x + 5) + 1(-3)

5x = -12x + 20 -3

17 x = 17

x = 1
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Q19 Answer (1,2)

6x + 5y = 25
x = 2y + 24
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x = 2y+24= 10
Check: 6(10)+5(-7)=25 good 2y+24=2(-7)+24=10=x good

Q20 Answer (10,-7)

3x + y = 18
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x=4
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Check: 3(4)+6=18 good, -7(4)+3(6)=-10 good

Q21 Answer: (4,6)

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3 years ago

Last year there were 520 students enrolled at Olsen Middle School . This year there are 572 students enrolled. What is the perce

RSB [31]

Answer:

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Step-by-step explanation:

We have procent:

520 —-> 100%

572 ——> x%

So, it is:

520*x=572*100

X=57200/520=110%

110%-100%=10%

6 0

2 years ago

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Ksju [112]

Answer hey:

Step-by-step explanation:

4 0

2 years ago

7. What is the slope of the line that passes through the pair of points (3, 8) and (9, 5) ? (1 point)

agasfer [191]

7. D
8. D
9. D
10.C

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$\frac{y2 - y1}{x2 - x1}$
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so you plug the numbers in
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x2=9
x1=3
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use the equation
$y - y1 = m(x - x1)$
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3 years ago

Read 2 more answers

|x + 1| + 4 ≤ 2

irga5000 [103]

Answer:

no solution

Step-by-step explanation:

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2 years ago