What is 87 and 46 rounded to the nearest place value?

How to solve a simultaneous equation involved with fractions?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?