PLEASE HELP TS URGENT £4500 is shared between 4 charities The donation to charity B is of the donation to charity D.
Charity D's donation is twice the donation to charity C.
The ratio of donations for charity C to charity A is 3:4.
Work out the donation to charity B.

Afurniture manufacturer produces chairs and sofas. each chair requires 10 yards of fabric, and each sofa requires 20 yards of fabric. the manufacturer has 300 yards of fabric available. to fulfill orders, the number of sofas must be at least twice the number of chairs. let x be the number of chairs and y the number of sofas. which inequalities are described in the problem? check all of the boxes that apply

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?