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Katyanochek1 [597]
3 years ago
6

Combine like terms to create an equivalent expression. 7.4z−5(−1.6z+2.4)

Mathematics
1 answer:
ryzh [129]3 years ago
6 0

Answer:   15.4z-12

Step-by-step explanation:

For this exercise it is important to remember:

  • The Distributive property:

       a(b\±c)=ab\±ac

  • The multiplication of signs:

        (+)(+)=+\\\\(-)(-)=+\\\\(-)(+)=-

Then, given the following expression:

7.4z−5(-1.6z+2.4)

You need to  apply the Distributive property. Then:

=7.4z+8z-12

Now you can combine like terms (or add the like terms). Then you get:

=15.4z-12

Therefore, the equivalent expression created by combining like terms, is:

 15.4z-12

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Do the values in the table represent a proportional relationship?
Marianna [84]

Answer:

NOT proportional

Step-by-step explanation:

y/x  = 5/2 = 2.5

y/x = 6/3 = 2

also 7/4 = 1. 75 and 8/5 = 1.6  so:-

They are NOT proportional

5 0
3 years ago
Jivesh brought his Model B rocket on a camping trip near the top of a mountain. He wants to model how it descends down the mount
dybincka [34]

Answer:

i. 1.63 s

ii. The negative time cannot be used in this context

Step-by-step explanation:

i. Since  h = −640t² and the rocket descends 1,690 m, h = -1,690 m (since there is a drop in height).

So,  h = -640t²

t² = h/-640

t = √(- h/640)

Substituting h into the equation, we have

t = √(- h/640)

t = √[-(-1,690)/640]

t = √2.640625

t = 1.625

t ≈ 1.63 s

ii. So, the negative time cannot be used in this context because, the height drop is negative.

8 0
3 years ago
Drag the correct description to tell whether the graph represents a function.​
nadezda [96]

Answer:

1) Not a function 2) function 3) function

Step-by-step explanation:

Use the vertical line test. If you draw a line on every vertical line on the graph and you see two points, it is not a function.

5 0
3 years ago
14. Andrew earns $6.25 per hour. He works 4 hours per day, 5 days
swat32

Answer:

$125 per week

Step-by-step explanation:

Andrew earns $6.25 per hour. If he works for 4 hours, solution will be:

$6.25 × 4 = $25 per day.

If Andrew works 5 days per week, then he earns

$25 × 5 = $125 per week.

Therefore by estimate, Andrew earns $125 per week.

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D

Step-by-step explanation:

8 0
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