Richard invests $188.21 every month into his retirement. At the end of 30 years, he has a balance of $156,198.12. What interest has accrued over 30 years?

Free 100 points to whoever says “oof the porridges” if it’s not exact, your answer will be reported, first person gets brainliest

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer