How do you solve 3x^6- 39x^4+ 108x^2= 0

How can you construct perpendicular lines and prove theorems about perpendicular lines

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?

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?