Lamont keeps track of his math grades by recording them in a table. He wants an average of 90, so he also lists the amount that each grade is above or below 90

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?

Currently, the largest cruise ship has a tonnage of 225,282 gross tons (gt). which of the following is a reasonable estimate for the tonnage of this cruise ship? a. 2 × 10^5 gt b. 2 × 10^6 gt c. 2 × 10^-5 gt d. 2 × 10^-6 gt

1/4x+5=3/4. i can't get access to the answer to this question! and, my request on "contact us" will not go