Solve the problem.Suppose that an worm population, P, in thousands per acre, is given by P = 
, where x represents time in months. Find the worm population after 4 months.
A. 22 thousand per acre
B. 90 thousand per acre
C. 18 thousand per acre
D. 20 thousand per acre
Answer: C
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Use a graphing calculator to make a conjecture as to whether each equation is an identity.cos(x + y) = cos x + cos y
A. Not an Identity B. Identity
Find the probability.The table lists the eight possible blood types. Also given is the percent of the U.S. population having that type.
Let E be the event that a randomly selected person in the U. S. has type B blood. Let F be the event that a randomly selected person in the U. S. has RH-positive blood.Find P(F|E).
A. 0.818 B. 0.340 C. 0.720 D. 0.107
Solve the system of equations by using the inverse of the coefficient matrix if it exists and by the echelon method if the inverse doesn't exist.-5x + 3y = 8-2x + 4y = 20
A. (2, 6) B. (-2, -6) C. (6, 2) D. (-6, -2)
Simplify the expression.
A. 
B. 
C. 
D. 
E. 