What is the sum of 4.2 × 10^5 and 5.3 × 10^5? a 95 × 10^5 b 95 × 10^10 c 9.5 × 10^5 d 9.5 × 10^10

Estimate the product. round the first factor to the nearest whole number, round the second factor to the nearest ten, and then multiply. 3 8/9 × 96

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.