ADEF has side lengths DE = 9, EF = 12, and DF = 15. Is this a right triangle?

The amount of money, in dollars, in an account after t years is given by a = 1000(1.03)^t. the initial deposit into the account was $_^a0 and the interest rate was _a1% per year. only enter numbers in the boxes. do not include any commas or decimal points^t. the initial deposit into the account was $__^a0 and the interest rate is % per year.

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)