Joslyn wants buy 4 packs of pens for $12.00 each and a pack of pencil for $6.00 how much money does she needs

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

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?