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# Two angles are complementary angles. One angle is twice as large as the other angle. Find the number of degrees in each angle (answer)

Complementary angles mean that the two angles, when added together, equal 90°.   Let's call the first angle x, and its second, complementary angle 2x.  So, we have x + 2x = 90.   Solving for x, we get x = 30.   Since the first angle was called x, that...

Quotient rule: "low d'high - high d'low, square the denominator and away we go"   This essentially means "[ (bottom function)*(derivative of the top function) - (top function)*(derivative of the bottom function) ] / (bottom function)2   Applying the quotient...

# What are the roots of the equation (answer)

You have to use the quadratic equation to solve this problem.   The general formula for the quadratic equation is x = {-b +- sqrt [ b2 - 4(a)(c) ]} / (2a)   Applying this formula to this problem, we get: {-(-7) +- sqrt [ (-7)2 - 4(2)(4) ]} / (2a)   From...

# What is the value of this expression when r=2,s=1, and t=0? (answer)

Maybe it's just my end, but I don't see the expression.

# Im a freshmen in highschool, I dont know how to do some algebra equations like (5x-2) ( x2-x3 )-(2x2-3x-4) someone please help me! (answer)

Hi John,   To solve this problem, first thing you'll want to do is multiply out the first set of parenthesis.  So, you want to multiply (5x-2) times (x2-x3).  This gives 5x3 - 5x4 - 2x2 + 2x3 = -5x4 + 7x3 - 2x2    Now, take (-5x4 + 7x3...

This is actually pretty straight forward.  Just multiply 3 all the way through.   So, we get 6x^2 + 18x + 9.

Awesome, thanks for posting an example.   So in this problem, we want to replace the x in f(x) with h(x).  That would give us f(12/x).  So in the function for f(x), where there is an x, we replace it with (12/x).   So, f(h(x)) becomes f(12/x) = (12/x)^2 +...

# I don't understand function notation such as how to find fg(x) or how to use functions in a graph or table (answer)

Hi,   Well, unless you have a specific example to work with, I may not be able to guide you to understanding how to use functions in a graph or a table.  I think those are best understood with examples.   Domain is all the possible values that x can take on.  Range...