It cost $0.25 to use a dryer at a laundromat for 15 minutes. The expression 0.25m ÷ 15

represents the cost, in dollars, of using a dryer for m minutes. What is the cost to use the dryer for 120 minutes?

See how many times 15 can go into 120.

If 15 • 8 is 120, then the cost would have to multiply by 8.

It costs $2.00 to use the dryer for 120 minutes.

We can also use the equation to help. We plug in 120 for m and solve.

We still end up with the same result: $2.00 for 120 minutes.

geometry: triangles

solvers

lessons

answers archive

call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584

hdjd

step-by-step explanation: