math
correct
help
a+2b = 4.25 a+7b = 8.50 (a,b) = (51/20,17/20) so, y = 2.55 + .85x
Science Help
weighs more on earth than on the moon
Algebra
if ab=0, then a=0 or b=0, so n=0 or 2n-5=0 n=0 or 5/2
Please Help - Math
107. Solve log_x 16 = -2 16 = x^-2 16 = 1/x^2 x = 1/4 108. e^(2 ln 3) (e^ln 3)^2 3^2 9
Math
40km/L * 7.25L = 290km
pride
7900(1+.043/4)^(4*3) = 8981.57
Physics
x = 4 cos -122 y = 4 sin -122
Trigonometry
x = (9±√41)/2 arctan(x) = 82.6° or 52.4° Don't know how to evaluate the arctan directly; it appears not to be any familiar angle
Math (Algebra)
complex roots always come in conjugate pairs. So, f(x) = (x-(4-i))(x-(4+i))(x-(2+3i))(x-(2-3i)) = ((x-4)^2 + 1^2)((x-2)^2 + 3^2) = (x^2-8x+17)(x^2-4x+13) = x^4 - 12x^3 + 62x^2 - 172x + 221 ...
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