How do you find the lengths of a 30°-60°-90° triangle?

Find the value of x for which abcd must be a parallelogram -9-6x x-30

How do i get my dad to stop making me gargle his pickle i want my mom to gargle my pickle not my dads

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed