Abag contains 6 red and 10 black marbles. if you pick up a marble, record it’s color and return it to the bag 200 times how many times can you expect to pick a black marble

Aplot of land has been surveyed for a new housing development with borders ab, bc, dc, and da. the plot of land is a right trapezoid with a height of 60 feet and an opposite leg length of 65 feet

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?

What is the benefit of converting measures in a ratio to the same unit