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Anestetic [448]
3 years ago
7

Jack spends 1 1/2 as long on his homework as Jill. Last week Jill spent 9 1/2 hours doing homework. How long did Jack spend doin

g his homework?
Mathematics
1 answer:
alina1380 [7]3 years ago
7 0
The amount of time Jill spent to do her homework 
= 9 1/2 hours. which equals to  570 minutes.

Which means, the amount of times Jack needed to do his is 
= 570 minutes x 1.5
= 855 minutes which equals to 14 1/4 hours

hope this helps
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solve the system of linear equations using substitution. Which expression would be eastier to substitute into the other equation
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7 0
3 years ago
As an estimation we are told 5 miles is 8 km. <br> Convert 27.5 miles to km.
lions [1.4K]

Answer:

44 km

Step-by-step explanation:

8/5 is the conversion between m and km which is 1.6 and then we can simply multiply 27.5 times 1.6 which is 44 km I hope this helps.

7 0
3 years ago
Determine where V(z)=z4(2z−8)3 is increasing and decreasing.
Marat540 [252]

Answer and Explanation:

A function is said to be increasing, if the derivative of function is f’(x) > 0 on each point. A function is said to be decreasing if f”(x) < 0.

Let y = v (z) be differentiable on the interval (a, b). If two points z1 and z2 belongs to the interval (a, b) such that z1 < z2, then v (z1) ≤ v (z2), the function is increasing in this interval.

Similarly, the function y = v(z) is said to be decreasing, when it is differentiable on the interval (a , b).

Two points z1 and z2 Є (a, b) such that z1 > z2, then v (z1) ≥ v(z2). The function is decreasing on this interval.

The function y = v (z)

The derivative of function Y’ = v’(z) is positive, then the function is increasing.

The function y = v (z)  

The derivative of function y’ is negative, then the function is decreasing.

8 0
3 years ago
What is 5x-(8x+9)+4.5x
AnnZ [28]
Simplify the brackets.
5x - 8x - 9 + 4.5x

Collect like terms
(5x - 8x + 4.5)-9

Simplify
1.5x - 9

Now give me your stuffed crust.
5 0
3 years ago
WRITE EACH NUMBER tWo different ways
12345 [234]
1) 500+60+3 and 563
2) 1 hundreds + 0 tens + 9 ones and 100+0+9

3) 9 hundreds + 2 tens + 23 ones and 23 ones?? not possible!.

4) 370 and 300 + 70 + 0

Hope my answer helps!
6 0
3 years ago
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