Answer:
6
Step-by-step explanation:
base + 2(legs) = 56 (2 legs are the same because it's isosceles)
x + 2(5x - 5) = 56
x + 10x - 10 = 56
11x -10 = 56
11x = 66
x = 6
There is 60% of red t-shirts 40% of them are white and blue so the reds are 60%
The correct answer should be the third option. YOU'RE WELCOME :D

Step-by-step explanation:
find the value of the constant of proportionality k

c =total cost
d =days