solve the equation using mental math

a + 1/3 = 6/7

A) 1 3/21

B) 5/10

C) 7/10

D) 11/21

Subtract the two expressions. 3x - 4 from - 2x + 8

The half-life of a radioactive element is five years. a scientist has 18 grams of the element. the equation representing the number of grams, g, after x years is what is the annual rate of decay

Determine the median value. 4.5, 7.5, 9, 9, 9.2, 9.3, 10, 10, 10.5, 13

Simplify (√2) (∛2) 2^1/6 2^2/3 2^5/6 2^7/6

Express the fraction 6/22 as a percent. Round the answer to the nearest whole percent.

Wilson drew a scale drawing of a community college. He used the scale 1 centimeter = 9 meters. In the drawing a building at the college is 18 centimeters long. What is the length of the actual building?

A Ribbon is 12 3/4 feet long. Into how many 3/4 foot pieces can it be cut?

A team won 3 of their first 10 games. If they win the next n games, they will have won 50% of their games. What does n equal?

The test scores of 40 students are listed below. Find P85. 30 35 43 44 47 48 54 55 56 57 59 62 63 65 66 68 69 69 71 72 72 73 74 76 77 77 78 79 80 81 81 82 83 85 89 92 93 94 97 98 89 87 85 34

How many arrangements of the letters in peppermill are there with?