H(t)=-5t^2+20+ After 3.5 seconds, how high is the water above the ground? (Hint you
need to use the equation to answer this question. Leave your answer as a decimal)

Officer brimberry wrote 24 tickets for traffic violations last week, but only 9 tickets this week. what is the percent decrease? give your answer to the nearest tenth of a percent.

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)