Which equation could be used to find the perimeter of an isosceles triangle, with two sides 5 inches long, a base 6 inches long and a height of 4 inches?
a. p = 2 (5 + 6)
b. p = (6 × 4) ÷ 2
c. p = 5 + 6 + 4
d. p = 2 × 5 + 6

The perimeter is just the sum of all the sides, so it can be expressed by:

P = 5 + 5 + 6

Since 5 + 5 = 2 x 5 then:

P = 2 x 5 + 6

And the answer is D

The perpendicular height is irrelevant here

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post