Answer:
15/4
Step-by-step explanation:
2 1/2 x 1 1/2
First, make them both improper fractions to make them easier to multiply
5/2 x 3/2
Multiply their numerators together to get the numerator and multiply their denominators together to get the denominator.
5 x 3 = 15
2 x 2 = 4
5/2 x 3/2 = 15/4
Step 1: -4(3x-1) becomes -12x+4
step 2: -12x+4=12-8x
step 3: add 12x to both sides, 4=12+4x
step 4: subtract twelve from both sides -8=4x
step 5: divide by 4, x=-2
If you plug that into a calculator you get 4.5
The two ends of the track are semi circles, so we need to calculate the circumference:
Circumference = PI x 56 = 175.84
The two straight parts are 130 m each:
Total perimeter = 175.84 + 130 + 130 = 435.84 m
The answer is D.
