The measure of a base angle of an isosceles triangle is 56°. what is the measure of the vertex angle?

68

56 + 56 = 112

180 - 112 = 68

b. 6 + 6 × 0.15 = 6 + 0.9 = 6.90

2.6 × 6.90 = 17.94

Explanation:

Find the new price using the formula retail price = original price + markup. Then find the total cost of buing 2.6 pounds at the new price.

c. 3.5 × 6 = 21

3.5 × 6.90 = 24.15

24.15 - 21 = 3.15

Explanation:

Find the total cost at each price and then subtract.