Giovanna used the calculations below to determine the height of a stack of 7 books that are each 2 5/8
inches thick what
was her error?
c. there should be a subtract step not an addition step
d. two should have been multiplied by 5/8

Option C. Seven was not multiplied by 5/8

Step-by-step explanation:

we know that

To determine the height of a stack of 7 books that are each 2 5/8  inches thick. multiply 7 by 2 5/8

so

therefore

Seven was not multiplied by 5/8

Option B.

Step-by-step explanation:

Giovanna did the calculations to determine the height of a stacks of 7 books having inches thickness of each book.

=18+

Now when compare this solution with Giovanna's solution we find error in 3rd step, in which she hasn't mutiplied the fraction by 7.

Therefore, option B is the correct one.

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation: