the expression 5a+3c can be used to find the cost of a adult and c children to attend the school play. What is the cost of 4 adults and 9 children to attend the school play?

Lee has $1.75 in dimes and nickels. the number of nickels is 11 more than the number of dimes. how many of each coin does he have?

Need same math paper but the back now i hope your able to read it cleary i need with hw

The diameter of the moon is about 3500 km. approximate the surface area of the moon using the formula for the surface area of a sphere, s = 4πr2. write your answer in scientific notation.