PLEASE I NEED HELP algebra2 lesson: solving quadratics equations

solve the equations, check your solution
1.) x^2+9=0

2.) x^2-4 = -11

How many different ways can you make change for $.50 using only nickels,dimes, and quarters?

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.

Mr.zimmerman invested $25,000 in an account that draws 1.4 interest, compouneded annually. what is the total value of the account after 15 years