Solve the pair of simultaneous equations x-4y=23 and y=2x+3​

What is the base of 1/9 to the power of 2

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

If $740 is invested at an interest rate of 11% per year and is compounded continuously, how much will the investment be worth in 7 years? use the continuous compound interest formula a = pert.