If a polynomial (x^2+ax-c) cuts x-axis at 2 and -4, the value of a+c is?

An ant travels at a constant rate of 30cm every 2 minutes. at what speed does the ant travel per minute

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?

Margaret is purchasing a house for $210,000 with a 15 year fixed rate mortgage at 4.75% interest she has made a 5% down payment the house is valued at 205,000 and the local tax rate is 3.5% homeowners insurance 600 per year what are her total monthly payment