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## Stanford Grad for Pre-cal/Trig/Calculus/Algebra/Physics Tutor

### San Mateo, CA (94401)

 Travel radius 20 miles Hourly fee \$30.00 Save up to 15%
 Background check passed 04/15/2013 Usually responds in about 13 hours You don't pay for tutoring unless you find a good fit! You don't pay for tutoring unless you find a good fit!

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# FIND THE 7TH ELEMENT (answer)

Using the formula where a0 is the initial value and an is the 'nth' term, while 'd' is the common difference:   a7 = a0 + (n-1) x d = 6 + (7-1) * x 6 = 6 + 36 = 42   QED

# ......................................................... (answer)

Using implicit differentiation:   x^-2 + y^-2 = cos(3x) - sin(3x) -2x^-3 (dx/dx) + -2y^-3 (dy/dx) = -3sin(3x)(dx/dx) - 3cos(3x)(dx/dx) crossing out dx/dx (which simplifies to 1) and isolating the dy/dx term: -2y^-3 (dy/dx) = -3sin3x - 3cos3x + 2x^-3 finally we solve for dy/dx...

# how to use the quadratic formula (answer)

The quadratic formula assumes you have a quadratic equation equal to zero.  In general:  ax^2 + bx + c = 0. In this case, 7x^2 + 123x - 4 = 0, so a = 7, b = 123, and c = -4 (c is negative because the standard form assumes a, b, and c are positive).     Now, we can use the quadratic...

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