Kyle to visit his grandmother. Her house is 306 miles away. His goal is to get there in 4.5
hours. What speed (rate) does he need to
drive at in order to meet his goal? Write an
equation to solve for r. then use it to solve.

D=rt

He needs to travel at the speed of 68 miles per hour.

Step-by-step explanation:

306 miles is the distance. 4.5h is the time. You want to find the rate.

D = RT

306 = R×4.5

R×4.5 = 306

R = 306 ÷ 4.5

  = 68

He needs to travel at the speed of 68 miles per hour.

(c, 0) i might be wrong so don't put full faith on my answer

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)