I dont get it!!

I dont get it!!

There are 420 students in kindergarten through third grade. If 1/4 of the students are in first grade, 20% are in second grade, and 115 students in third grade, how many students are in kindergarten...

? grams of 12% solution of boric acid and ? grams of 20% solution of boric acid.

? gallons of 80% acid and ? gallons of 50% acid.

This answer is in percents(%).

Please help me

Hello I am new to this and I am in a rush so can I have my answer fast please!

The first number is ? the second number is ?.

This is tricky and I cant solve it please help me.

Please help with this question. I need this to study for my math test tomorrow. Thank you for all your help.

Miguel starts a job working as a biochemist and earns $76,500 a year. He saves 10 percent of his income. After working for one year, he invests what he has saved in an account that pays 2.5 percent...

how to solve annuity http://i.imgur.com/zD5Qt77.png?1

I have a picture of the figure here: http://imgur.com/gallery/TAYa0tz So here is the situation: I have to give the statement and the reason to end up with the Proof. It's a 2 column proof...

If m varies directly as n and inversely as o, and m = 20 when n = 50 and o = 10, find m when n = 96 and o = 16.

Simplify: -3a(square root -112a^-1b^5c^21) Find he x-intercepts and y-intercepts of each: f(x) = -2x^3+6x^2+9x g(x)=2x-1/2x^2&#...

Write an equation in standard and slope-intercept form for the line described through (9.2) parallel to y= -6. and same for (2,7) perpendicular to 3x+5y= 1

a) simplify (x2-4x-12)(2x+3)2 / 2x2-9x-18 b) hence, show that [(x2-4x-12)(2x+3)2/ 2x2-9x-18] - 7x is always positive for any values of x, except x = -3/2 or 6. My...

a.) Let x = the number of years after 1990 and let y = average cost of a new car. What ordered pairs can be written to express this information? b) Write the equation of the...

What is the value of the discriminant for 5x^2 + 7x = 6 ? How many different real number solutions does the equation have? Thanks SO MUCH for answering! :)

http://i.imgur.com/l2iJATg.png

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