Use the ruler to determine the length of this object. Record your answer to the nearest tenth. The object is centimeters long.

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?