An oil tanker can be emptied by the main pump in 4 hours. An auxiliary pump can empty the tanker in 7 hours. If the main pump is started at 5 PM , when should the auxiliary pump be started so that the tanker is emptied by 8 PM ?

What is 0.2 written as a decimal or mixed number?

Graph of g (x) = x2 - 5

Johnny did a survey and discovered that 5 out of 32 students walk to school. if 3 students are randomly selected from johnny's school, without replacement, what is the probability that all 3 students walk to school?

Write 19h15min into a fraction

12x 3000 this is for u my bud answer it quickly

Would you rather Run at 100 mph or fly at ten mph?

Solve the differential equation by variation of parameters, subject to the initial conditions y (0) = 1, y' (0) = 0. 9y'' - y = xex/3

Joey rolls a regular number cube. What's the chance he rolls an even number? Record your answer as a simplified fraction using "/" as your fraction key.

You are playing a game and it is your turn to spin the spinner shown. There are four possible results: blue, green, yellow, or purple. What is the probability that you land on purple?

seventy percent of the 100 students in a middle school cafeteria bought their lunch. Some of the students that bought their lunch leave the cafeteria to attend an assembly. Now only 60% of the remaining students bought their lunch.