Divide. Simplify, if possible.-0.78 ÷ 2
A. 0.39
B. -0.53
C. 0.53
D. -0.39
Answer: D
Mathematics
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A. 2x + 2y B. (x2)y C. (2y)x D. 2(xy)
Mathematics
Provide an appropriate response.Simplify: (-4)(-2)
Fill in the blank(s) with the appropriate word(s).
Mathematics
Solve the problem.Write an equation for the tangent line to the curve 
at the point 
A. 5x + 7y = 70 B. 5x + 7y = 35 C. 7x + 5y = 70 D. 7x + 5y = 35
Mathematics
Solve the problem.A sample of 650 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 30 years? Round to the nearest whole gram.
A. 0 g B. 298 g C. 1 g D. 341 g
Mathematics