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PIT_PIT [208]
3 years ago
9

What is the value of this expression when k=5? (3k)2 -10

Mathematics
2 answers:
Fittoniya [83]3 years ago
4 0
It is 20 if you plug in 5 for k
Leviafan [203]3 years ago
4 0
First you expand the multiplication so it will be more easier to sub in later.
6k-10

sub in k=5 into the equation
6(5)-10=20
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4 0
3 years ago
Josh and Greg leave from the same place
nasty-shy [4]

9514 1404 393

Answer:

  • Josh: 32 mph, 64 mi
  • Greg: 64 mph, 320 mi

Step-by-step explanation:

Let x represent Josh's rate of travel in miles per hour. After 2 hours, his distance is ...

  distance = speed · time

  distance = x · 2 = 2x

Then 2x is Greg's rate of travel After 5 hours, his distance is ...

  distance = speed · time

  distance = (2x) · 5 = 10x

The distance they are apart is ...

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__

Josh's rate: 32 miles per hour; Josh's distance = (2 h)(32 mi/h) = 64 miles.

Greg's rate: (32 mi/h)·2 = 64 mi/h; Greg's distance = (5 h)(64 mi/h) = 320 miles.

<em>__</em>

<em>Check</em>: 320 miles - 64 miles = 256 miles . . . . correct separation

6 0
3 years ago
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