Michael has a summer job as a bricklayer’s assistant. He is responsible for mixing the concrete. concrete is made of cement, sand, and gravel in a ratio of 1:3:4 by mass. michael needs to make 80 kg of concrete.

What is the solution set of the quadratic inequality x^2-5< or equal to 0

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?

Prove that 16^4-2^13-4^5 is divisible by 11.