Evaluate an expressions: 4a + 3b + c if a = 8, b=-2 and c = 4 For 25 points 7th grade math

If a =6, what is the value of 2a(3b + 5c)?

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

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)