a chemist has two solutions of hci one has 40% conventration and the other has 25% concentration. how many liters of each solution must be fixed to obtain 66 liters of a 31% solution

Which of these is the algebraic expression for "six more than the product of seven and some number?" A. 6 + 7 + x B. 7x + 6 C. 6 + 7 : x D. 7 + 6x

How do i find the vertex of y=-0.05x^2+1.25

Sydney made 21 wooden penguins to sell at a fair. She used 5 pompoms and 4 beads to decorate each penguin. How many pompoms and beads did she use for the wooden penguins in all.

7x^2-x=6 find the sloution

How many integer solutions are there to the equation x1+x2+x3=0 if x1, x2, x3 > - 5?

53-_ = 30 find missing number

Aunt Annie and her family traveled 253 miles on Tuesday and 157 miles on Wednesday. It is 473 miles from Annie's to Grandma's How many miles do they have left to travel on Thursday?

There are 56 students in the orchestra and twice that number in the band. There are 23 boys and 24 girls in the choir. If each student only participates in one group, how many students total are there in the orchestra, the band, and the choir?

What is the length of the diagonal of the rectangle? A) 29.75 B) 10.625 C) 126.4375 D) 21.25 With sides of 12.75 and 17 on the bottom.

An equilateral triangle's perimeter and a rectangle's perimeter have the same numerical value. The length of the rectangle is the same as the side of the triangle. The width of the rectangle is 12. What is the length of the rectangle?