Is 500 a good estimate for the sum of 362 and 211 explain why or why not

What value is equivalent to 5 + [5 × (4 + 2)]? a) 35 b) 45 c) 60 d) 110

An an average person has 6×10 by the power of two as many red blood cells as white blood cells a small sample of the blood has 7×10 by the power of three white blood cells about how many red blood cells are in the sample

If y varies directly as x2 and y=6 when x=6, find the constant of variation.