On Monday, Greg walks the entire length of a trail that is 4 3/4 miles long. On Tuesday, he walks the entire length of a trail that is 3.8 miles long. On Wednesday, he starts out on a trail that is 2 3/5 miles long, but he does not walk the final 1.7 miles. How many miles does Greg walk in all on Monday, Tuesday, and Wednesday?

D) 9 9/20

Step-by-step explanation:

Step 1:

4 3/4 + 3.8 + (2 3/5 - 1.7)

Step 2:  Order of Operation (AKA PEMDAS)

4 3/4 + 3.8 + (2 3/5 - 1.7)

Step 3:

4 3/4 + 3.8 + (9/10)

Step 4: Add it all up

4 3/4 + 3.8 + (9/10) = 9 9/20

step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: