multiply number of pieces by size to find how much she has:
8 x 6.2 = 49.6 feet
Subtract what she has from what she needs to find how much more she has to get:
90-49.6 = 40.4 feet more
Answer:

Step-by-step explanation:
We begin with the expression

First, we can split this into the product of two fractions

Now, we can factor the denominator of the first fraction.

Next, we need to create a common denominator for the second fraction

Now to return this portion to the denominator of the second fraction.

Dividing by a fraction is the same as multiplying as the reciprocal of the fraction, so the second fraction becomes

Now to reduce this expression by canceling out 

(400,000 + 230,000) / 16.5 = 630,000 / 16.5 = 38181.8....rounds to 38182 units
The student took 7 tests.
99+98+88+88+88+88+88 = 637
637/7 = 91