I need to know what the variable is and please give me the equation. THIS IS TIMED AND I NEED IT FAST I ONLY HAVE A FEW MINUTES!!!

Aright triangle includes one angle that measures 30º. what is the measure of the third angle? a. 30º b. 90º c. 60º d. 130º

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

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a, b and c integers and a> 1