After 1 year, $800 deposited in a savings account with simple interest had earned $64 in
interest. What was the interest rate?
Use the formula i = prt, where i is the interest earned, p is the principal (starting amount),
is the interest rate expressed as a decimal, and t is the time in years.

8%

Step-by-step explanation:

We will use the equation provided to solve this problem.

Lets plug in the values:

    First, divide both sides by 800.

        Multiply x by 1

Now, we multiply .08 by 100 to get our interest rate:

(.08)100 = 8

The interest rate is 8%

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x