In the example the problem 0.000000005=5×10^-9. what is the standard form of 10^-9

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)

Graph the system of equations. {6x−4y=−244x−8y=−32 use the line tool to graph the lines.

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42