A chemist has three different acid solutions. The first acid solution contains 25% acid, the second contains 45% and the third contains 90%. He wants to use all three solutions to obtain a mixture of 45 liters containing 65% acid, using 2 times as much of the 90% solution as the 45% solution. How many liters of each solution should be used?

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

Will give the box plots below show the math scores of students in two different classes: class a 55 72 75 89 95 class b 55 70 75 94 100 based on the box plots, which statement is correct? a: the median score of class a is greater than the median score of class b. b: the lower quartile of class a is greater than the lower quartile of class b. c: the upper quartile of class a is greater than the upper quartile of class b. d: the maximum score of class a is greater than the maximum score of class b.