# Expression of a variable from the formula - practice problems

#### Number of problems found: 2636

- Lara's sequence

Lara starts with a number less than 20. She divides it by 2 adds 6. She then divides this result by 3 her answer is 4.5 What number does she start with? - One muffin

Eight muffins and one drink cost $8.12. If the drink costs $1.24, find the cost of one muffin. - Rhombus 36

Rhombus ABCD with side 8 cm long has diagonal BD 11.3 cm long. Find angle DAB. - Mixed numbers equation

4 5/9 is the same as the sum of 2 1/3 and 5/6 times a number. What is the number? Enter your answer as a mixed number in simplest form in the box. - 13 times

1/3 times the sum of a number and 2.6 is 4.9. What is the number? Enter your answer as a simplified mixed number in the box. - The average 12

The average of the first five numbers drawn was 2499. the first four numbers were 4165, 320, 7142, and 64. What was the fifth number? - Soup mixes

You sell soup mixes for a fundraiser. For each soup mix you sell, the company that makes the soup receives x dollars, and you receive the remaining amount. You sell 16 soup mixes for a total of (16x+96) dollars. How much money do you receive for each soup - Height of the box

The box needs to have a volume of 108 ¾ cubic inches. If the width of the box is going to be 7 ¼ inches, and depth of the box is going to be 1 ¼ inches, what must the height of the box be? - Perimeter - general

Solve: the perimeter of a triangle is 4x+1.if two of it side are(x+2) and (x-1). Find the third side. - The proportion

The proportion's first, second, and third terms are 4, 20, and 13. Find the fourth term. - The mean 2

The mean cost of 4 items was $39.96. The first item cost $28.50, the second item cost $41.25, and the third item cost $50. Find the cost of the fourth item. - Correct mean and CV

For a group of 100 students, the mean and coefficient of variation of their marks were found to be 60 and 25, respectively. Later, it was found that the scores 45 and 70 were wrongly entered as 40 and 27. Find the corrected mean and coefficient of variati - The capacitor

The parallel square plates of a 4.5µF Teflon capacitor are 3.2 mm apart. What is the area of the plate? - The enrolment 2

The enrolment at a school has increased from 1400 learners to 1600 learners over 5 years. What is the percentage increase in enrolment? - Petra 6

Petra sold an item for 4000 and made a 40% profit. What was the cost price of the product? - A rectangle 13

A rectangle has an area of 15 square inches. What is the missing side length if one side length is 1 2/3 inches wide? - Tomato plant

Bruce's grandmother loves to use fresh tomatoes in her homemade pasta sauce. Bruce thought she might like to grow her own, so he bought her a planter box and a tomato plant. The planter box is shaped like a rectangular prism. It is 12 1/2 inches long, 10 - Two numbers 17

The sum of two numbers is 9, and the sum of their cubes is 189; find the sum of their squares. - Collinear lines

Points A, B, and C are collinear, and B lies between A and C. If AC = 48, AB = 2x + 2, and BC = 3x + 6, what is BC? - The triangle 6

The triangle has an area of 7 ⅞ cm² and a base of 5 ¼ cm. What is the length of h? Explain your reasoning.

Do you have homework that you need help solving? Ask a question, and we will try to solve it.