What is the substitution
3x-5y=11; x=3y+1

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height