Nancy bought two pairs of summer sandals at 50% off. One pair originally sold for $18.00, the other pair for $22.00. How much did Nancy spend?

$20

Step-by-step explanation:

18/2=9

22/2=11

$11+$9=$20

Question 1:

For this case we have that by definition, the GCF of two numbers is the largest number that is a factor of both numbers. For example, the number 10 is the biggest factor that 50 and 30 have in common.

We must find the GCF of the following expression:

We look for the prime factorization of each number:

The GCF of the three numbers is

So:

Option C

Question 2:

For this case we have that by definition of power properties of the same base, that:

That is, for multiplication of powers of the same base, the same base is placed and the exponents are added.

So:

Option A