My friend needs help on a question. Can someone help me?

B 42 miles per hour

Step-by-step explanation:

Take the distance and divide by hours

105 miles ÷ 2 .5 hours

42 miles per hour

Well to get the answer to the question, simply complete a multiplication process.  This would be the following equation -

2.5 * X = 105

Now just plug in the options to get the answer.  After doing so, you will find that-

2.5 * 42 = 105

Therefore the correct answer is B. 42 miles per hour.

-Hope this helped you out.

it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

step-by-step explanation:

copy and paste, put it in google

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0