4. Find the balance of a savings account at the end of 7 years if the interest earned each year is 6.5%. The principal is $400

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

The sum of the first eight terms of an arithmetic progression is 9m + 14. the fifth term of the06 progression is 2m - 6, where m is a constant. given that the first term of the progression is 26,find the value of the common difference, d and thevalue of m.