Isaac wants the equation below to have no solution when the missing number is placed in the box. Box (x + 2) + 2 x = 2 (x + 6) + 4 x

Which number should he place in the box?
2
4
6
8

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

Solve each quadratic equation by factoring and using the zero product property. [tex]x^2+6x+8=0[/tex]

Having a hard time understanding this question (see attachment).