PLEASE HELP: An ocean wave has an amplitude of 8 ft and a period of 18 seconds. Write a cosine function to model the height, h(t), of the wave, after t seconds.

Abbey purchased a house using a fixed rate mortgage. the annual interest rate is 4.2% compounded monthly for 20 years. the mortgage amount is $235,000. what is the monthly payment on the mortgage? this isn't a multiple choice question have to show my work

For how answer my question this will be the last question can you answer in math subject

How many real-number solutions does the equation have? -4x^2 + 10x + 6 = 0 a. no solutions b. two solutions c. infinitely many solutions d. one solution