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.

answer: ask

step-by-step explanation:

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,