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olga_2 [115]
3 years ago
8

Question -4x - 9 = -13?

Mathematics
1 answer:
olganol [36]3 years ago
8 0

<em>X= 1.</em>

<em>For this expression to be correct, you would have to make sure that -4 stays -4. Any negative number subtracted by a positive number makes it go farther down into the negatives as a result even if the 9 is positive.</em>

<em>Hope this helps and have a nice day.</em>

<em>-R3TR0 Z3R0</em>

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Sam can mow a lawn in 30 minutes. Rocky can mow the same lawn in 90 minutes. How long does it take for both Sam and Rocky to mow
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Answer:

\frac{45}{2} \ minutes

Step-by-step explanation:

Given:

Sam can mow a lawn in 30 minutes.

Rocky can mow the same lawn in 90 minutes.

Question asked:

How long does it take for both Sam and Rocky to mow the lawn if they are working together?

Solution:

By unitary method:

<u>For Sam</u>

Sam can mow  in 30 minutes = 1 lawn

Sam can mow  in 1 minute = \frac{1}{30}\ lawn

<u>For Rocky</u>

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Rocky can mow in 1 minutes = \frac{1}{90} \ lawn

In a case of working together:

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                                             = \frac{3+1}{90} = \frac{4}{90} \ lawn

To mow \frac{4}{90} \ lawn together, it takes = 1 minute

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Thus, both Sam and Rocky will mow the lawn together in \frac{45}{2} \ minutes                    

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Vinil7 [7]

Answer:

don't

know

Step-by-step explanation:

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