What is wrong with Logan’s work?

Question

Logan is solving this problem:

The cheetah ran 0.05 hours at a rate of 70 mph. How far did the cheetah run?

Logan solves the problem by writing:

 

What is wrong with Logan’s work?

Logan used the wrong formula. He should have usedA = bh.

Logan did not use parentheses when substituting, and he did not multiply the numbers.

Logan’s work is correct.

Logan labeled his answer incorrectly. The correct label is feet.

 

Answer 1

d=rt so distance in miles=70*0.05=3.5 miles. Logan didn't multiply the numbers; he added them by mistake. Answer 2. He didn't have to use parentheses, he just needed to multiply the speed by the time.

Answer 2

Logan did not use parentheses when substituting, and he did not multiply the numbers.