3 years ago

Can someone help me do this problem and explain it to me step by step? If so I’ll mark you brainliest

Mathematics

1 answer:

Advocard [28]3 years ago

7 0

Answer:

-21

Step-by-step explanation:

1) if r = -4

Substitute r = -4 in 3r - 9

= 3 * (-4) - 9

= -12 - 9

= -21

2) ( 4 / 7 ) * x = 16

4 * x = 16 * 7

x = 4 * 7

x = 28

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