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x + y = 02x +3y = -7{“version”:”1.1″,”math”:”x + y = 02x +3y = -7″}Solve the system of the equations by substitution for x.   

Solve. The half – life of silicon – 32 is 710 years. If 30 grams is present now, how much will be present in 300 years? (Round your answer to three decimal places.)

Write the first four terms of the sequence define by the recursion formula.  a1=-2 and an=-3an-1 for n≥2{“version”:”1.1″,”math”:”a1=-2 and an=-3an-1 for n≥2″}

Evaluate the given binomial coefficient.  62{“version”:”1.1″,”math”:”62″}

Solve the exponential equation. Express the solution set in terms of natural logarithms.  ex+5=2{“version”:”1.1″,”math”:”ex+5=2″}

Find the slant asymptote, if any, of the graph of the rational function.  f(x) = x2+5x-3x+9{“version”:”1.1″,”math”:”f(x) = x2+5x-3x+9″}

Find the domain of the logarithmic function.  f(x) = log(x+9x-4){“version”:”1.1″,”math”:”f(x) = log(x+9x-4)”}

Evaluate the expression without using a calculator.  eln9x3{“version”:”1.1″,”math”:”eln9x3″}

Complete the square and write the equation in standard form. Then give the center and radius of the circle.  x2 + y2 +4x +10y =7{“version”:”1.1″,”math”:”x2 + y2 +4x +10y =7″}

Solve the system of equation.  y = 6×2-5xy=2x+3{“version”:”1.1″,”math”:”y = 6×2-5xy=2x+3″}