Find (6×10−5)×(4×109). Write your answer in scientific notation.

(6×10−5)×(4×109)=

Estimate each quotient. show the compatible numbers you use. 0.02848 ÷ 0.00579

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.