The wait time at a bus stop in minutes is a continuous random variable with probability density function f(x)=x21,125 from 0 to 15 minutes. Use Excel to find the probability that a randomly selected passenger will have to wait at least 12 minutes for the bus to arrive. Use an interval width of 0.1.

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4

Katie wants to collect over 100 seashells. she already has 34 seashells in her collection. each day, she finds 12 more seashells on the beach. katie can use fractions of days to find seashells. write an inequality to determine the number of days, dd, it will take katie to collect over 100 seashells.