Can someone help plz I’m stressing!

What is 1/2 x (6 x 4)+3 + 2 show your work

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

Factor x2 – 8x + 15. which pair of numbers has a product of ac and a sum of what is the factored form of the