Algebra/Expert Profile

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Recent Answers from Socrates

2012-01-19 College algebra:

Eliminate the innermost (round) brackets first     45-[4-2y-4(y+7)] = -4(1+3y)-[4-3(y+2)-2(2y-5)] =    45-[4-2y-4y-28] = -4-12y-[4-3y-6-4y+10] =    45-[-6y-24]=-4-12y-[-7y+8] =    now eliminate the square

2011-11-27 algebra:

Let E(t) = at + b    In 1993 the life expectancy was 71.3    t is the number of years since 1993 , so in 1993 t=0 and so    E(0) = 71.3 = (a)(0) + b    71.3 = b      In 1998 the life expectancy was 75

2011-10-18 Algebra:

Let t = the number of t shirts  Let h = the number of hats    The number of T-shirts was three times the number of hats    t = 3h    hat price = $5  t-shirt price = $8    the seniors sold everything and

2011-09-19 Algebra:

(y/x)(1-x/y) = y/x - 1     y - x/7 + 2x = y + (13/7)x      so we want to simplify     (y/x - 1) / (y + (13/7)x)    To eliminate fractions from the numerator and denominator , multiply numerator and denominator

2011-03-19 Equation:

This polynomial does not factor , so we must use the quadratic formula to find the roots.    x = (-b +- √ (b^2 - 4ac))/2a    a = 3 ,  b = -2 , c = 1      x = (2 +- √ (4 - 12))/6    x = (2 +-