What quantity of 61% hydrochloric acid solution must be mixed with a 21% hydrochloric acid solution to produce 277.5 mL of 53% solution? ​

Agroup of students want to create a garden. they do not know the exact measurements but they propose using a variable to represent the length and width of the garden. the length of the garden is 10 feet longer than double the width. use a single variable to write algebraic expressions for both the length and width of the garden. write an algebraic expression for the area of the garden. use mathematical terms to describe this expression.

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top

Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.