1.9r+0.1r=0.6 what s the value of r

How do you write something in scientific notation?

Askateboard ramp is in the shape of a right triangle what is the height of the ramp

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?