Which expression is equivalent to 0.75a + 10b + a + 2b? 0.25a + 8b
1.75a + 12b
1.75a + 10b
0.25a + 10b

How can you tell when x and y are not directly proportional?

The graph shows the distance kerri drives on a trip. what is kerri's speed?

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?