Trying to get the formula to figure out this question

If b-a=c-b=d-c, what is d-b

At Pam's Beading Boutique, 22% of the 1,850 beads on clearance are plastic. How many plastic beads are there on clearance?

Frank got a gift for his sister and put it in a shoebox. Note: Figure is not drawn to scale. Now, he wants to wrap it with wrapping paper.

A new sidewalk will be 4 feet wide and 50 yards long. Eighty pounds of concrete mix covers 4 square feet and costs $3.65. How much will the concrete for the new sidewalk cost?

9.684x√22√ : (987.56:π)

Simplify the expression: 4x2 - 8y + 3x - 9x2 + 10y

What is 20% of 605?

What is 76 divided by 5

Jennie and 5 of her friends are going to open skate night. Jennie does not have a membership card. Only some of her friends have membership cards. What is the total amount that Jennie and her friends might pay for admission?

kristy ran 24 laps in chairity run and then walked 0.2 kilometer to the presentation table. The total distance Kristy traveled was 29.6 kilometers. What was the distance of each lap? Explain how you solved the problem.