Atank that is 40% full contains 648 gallons of water. use a double number line to find the maximum capacity of the water tank.

Here is what the numbers would look like on a number line.  They are lined up.

10%  20%  30%  40%  50%  60%  70%  80%  90%  100%
162   324   486   648   810   972   1134  1296  1458  1620

The maximum capacity is 1620 gallons of water.

The answer is mathg.a.y

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.