Grace is traveling to an island for vacation. she drives from home at a constant rate for the first 154 miles, then takes a ferry to travel the last 35 miles from the coast to the island. the ferry travels at a constant rate that is half the rate at which grace drives. given that the entire trip takes 4 hours, complete the statement below. grace drives at a rate of miles per hour.

By definition, we have to:

Where,

t: time

d: distance

v: speed

Let's define the following variable:

v: Grace's speed

We write the equation that models the problem:

From here, we clear v.

We have then:

Substituting values we have:

Grace drives at a rate of 56 miles per hour.

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation: