What amount of a 75% acid solution must be mixed with a 25% solution to produce 500 ml of a 60% solution?

Step-by-step explanation:

If x is the volume of 75% solution, and y is the volume of 25% solution, then:

x + y = 500

0.75x + 0.25y = 0.60(500)

Solving the system of equations:

0.75x + 0.25(500 − x) = 0.60(500)

0.75x + 125 − 0.25x = 300

0.50x = 175

x = 350

y = 150

You need 350 mL of 75% solution and 150 mL of 25% solution.

isaiah walks 3 miles due north, turns and then 5 miles due east. how far is he from his starting point?

a^2 + b^2 = c^2

let c = distance from starting point.

(3)^2 + (5)^2 = c^2

9 + 25 = c^2

34 = c^2

sqrt{34} = sqrt{c^2}

sqrt{34} = c

answer: the center is the median and/or mean of the data. the spread is the range of the data. and, the shape describes the type of graph. the four ways to describe shape are whether it is symmetric, how many peaks it has, if it is skewed to the left or right, and whether it is uniform. good luck

step-by-step explanation: