Bobby had $1,360 in a savings account with simple interest. He had opened the account with $1,000 exactly 4 years earlier. What was the interest rate?

Equation for the calculation double 2 and then add 5

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?