An earthquake in Oklahoma measured 3.0 on the Richter scale use the formula r equals log a / a to determine approximately how many times stronger the wave amplitude of a on the earthquake was than a zero

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1