Isabel tried to evaluate an expression step by step.
find isabel's
a. step 1.
b. step 2.
c. step 3.
d. isabel did not make a mistake.

Estimate each quotient. show the compatible numbers you use. 0.00438 ÷ 0.00072

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?