8 - 2x = 5(x - 2) which step is not part of solving the problem?

Mathematics

2 answers:

RUDIKE [14]3 years ago

7 0

C. 8 - 2x = 5x - 2 is the anwser

Andrews [41]3 years ago

5 0

Answer:

Option C

Step-by-step explanation:

$8 - 2x = 5(x - 2)$

Multiply 5 inside the parenthesis

$8 - 2x = 5x - 10$

Now we add 2x on both sides

$8=7x-10$

Add 10 on both sides

$18=7x$

Divide both sides by 7

x= 18/7

8 - 2x = 5x - 2 is not in the steps

Option C is the answer

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DENIUS [597]

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Fran swims at a speed of 2.8 mph in still water. The Lazy River flows at a speed of 0.6 mph. How long will it take Fran to swim

kati45 [8]

Answer:

1. Upstream Time: 1 hour (or 60 minutes)

2. Downstream Time: 0.65 hour (or 39 minutes)

Step-by-step explanation:

The time it will take goes by the distance formula:

$D=RT$ , where D is the distance, R is the rate (speed), and T is the time.

For Upstream, you are going against the current, so your still water speed slows down. So upstream rate is still water rate - stream rate. So 2.8 - 0.6 = 2.2mph

Time it will take him to swim 2.2 miles, is:

$D=RT\\2.2=2.2(T)\\T=\frac{2.2}{2.2}=1$

So, 1 hour

For Downstream, you are going with the current, so your still water speed increases. So downstream rate is still water rate + stream rate. So 2.8 + 0.6 = 3.4 mph

Time it will take him to swim 2.2 miles, is:

$D=RT\\2.2=3.4(T)\\T=\frac{2.2}{3.4}=0.65$