Acar tracked 640 miles at a certain speed. if the speed of had been 8 mph faster, the trip could have been made in 4 hours less time. find the speed.

Step-by-step explanation:

Distance = rate × time, or  

d=rt, so

         Let x = original speed.

Then x + 8 = faster speed

       Let t₁  = time at original speed

      And t₂ = time at faster speed

    Then t₂ = t ₁ - 4

Check:

OK.

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing

step-by-step explanation:

x > 1.3

step by step:

8.5−0.9x> 9.8−1.9x

step 1: simplify both sides of the inequality.

−0.9x+8.5> −1.9x+9.8

step 2: add 1.9x to both sides.

−0.9x+8.5+1.9x> −1.9x+9.8+1.9x

1x+8.5> 9.8

step 3: subtract 8.5 from both sides.

1x+8.5−8.5> 9.8−8.5

1x> 1.3

step 4: divide both sides by 1.

1x/1 > 1.3/1