Round the factors then multiply the estimates.
Estimate the product of 315 × 439

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

The radius of a sphere is 3 inches. which represents the volume of the sphere?

Hurry which expression is equivalent to 3√x^5y?