8. mark can clean his father's office in 30 minutes. his younger sister lynn can clean the office in 40 minutes. how long will it take the two of them together to clean the office?

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest