If an object weighing 50 n displaces a volume of water that weighs 10 n, what is the object’s new weight?

What is the simplified form of x + 8/3x + 7 + x +7/x+4

What is 32+4 x (16 x 1/2) -2 show your work}

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?