Abag contains 7 green marbles 9 red marbles 10 orange marbles and 10 blue marbles you choose a marble and replace it and choose again what is p (red then blue)
a. 77/164
b. 19/41
c. 90/1681
d. 45/41

For red is it is 9/41 and or blue it is 10/41 so together 19/41 so the answer  is b: 19/41

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

Hello!
volume of sphere =4/3.pi.r^3