Can someone help me on this please

When eating out, record the total cost of your meal (before tip) and the tip that you left. determine the percent of the cost of the meal that you left as a tip.

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

Which choice names the hypotenuse of triangle xyz? a. segment yx b. segment yz c. segment ab d. segment zx