Solve the system of linear equations using matrices.
A. ?
B. {(x,y) 
}
C. (-1, -4)
D. (-2, -2)
Answer: A
Mathematics
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Collect like terms and write in descending order.-3m9 + 12m7 - 3m2 + 12m9 - 4m7
A. 9m9 + 8m7 - 3m2 B. 4m18 C. Can't be simplified D. 72m
Mathematics
Evaluate the polynomial function for the given value of the variable.Find P(-1): P(x) = -2x3 - 7x2 + 5x - 5
A. 9 B. -9 C. -15 D. -5
Mathematics
Solve the problem.A sample of 400 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 20 years? Round your answer to the nearest whole gram.
A. 1 g B. 0 g C. 33 g D. 243 g
Mathematics
Use the given information to find the exact value of the trigonometric function.sin ? = 
, tan ? > 0
Find cos 
.
A. 
B. 
C. 
D. 
Mathematics