Answer:

GCF = 1

for the values 15, 17, 21

Solution by Factorization:

The factors of 15 are: 1, 3, 5, 15

The factors of 17 are: 1, 17

The factors of 21 are: 1, 3, 7, 21

Then the greatest common factor is 1.

**Answer:**

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**Step-by-step explanation:**

1 foot = 12 inches.

5 ft x 12 inches per foot = 60 inches.

60 inches + 10 inches = 70 inches.

Sara was 70 inches tall.

Now convert to centimeters:

70 inches x 2.54 centimeters per inch = 177.8 cm's.

Round to nearest centimeter = **178 cm's.**

1. 9b

2.x^5

3.(3y)/12

4.(1-k)+7