Solve the problem.Roberto invested some money at 6%, and then invested $3000 more than twice this amount at 10%. His total annual income from the two investments was $3160. How much was invested at 10%?
A. $2500
B. $22,000
C. $25,000
D. $9000
Answer: C
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Solve the problem.Write an iterated triple integral in the order 
for the volume of the tetrahedron cut from the first octant by the plane 
.
A. 
B. 
C. 
D. 
Graph the circle.x2 + y2 = 36
A. 
B. 
C. 
D. 
Identify the given number as "Rational", "Irrational", or "Not a real number". If the number is rational, give its exact value. If the number is irrational, give a decimal approximation to the nearest thousandth.- 
A. Rational, -11 B. Irrational, -11.000 C. Irrational, -60.500 D. Not a real number
Use the hybrid selection model described to find the percent y (in decimal form) of the population that has the indicated characteristics as a function of time ?t (in generations).
?
when 
; 
when 
?
?
A. ?
B. ?
?
C. ?
D. ?
E. ?