A round plate in. in diameter is to have ten holes drilled through it. This is accomplished by creating a drawing for half the circle and the then "mirroring" the drawing for the other half of the circle. The in. diameter holes are to be equally spaced on a

style="vertical-align:-1px;" varid="variable_id_field" variablename="impvar_9d60b06a63a046538f1fc4609" class="wirisformula" /> in. concentric circle in the top half of the plate. What is the angle A between the holes? What is the angle B between the horizontal and each of the end holes? 



A. A = °, B = °
B. A = °, B = °
C. A = °, B = °
D. A = °, B = °
E. A = °, B = °

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Answer: E

Mathematics

Perform the indicated operation. ? 

A.
B.
C.
D.

Use a tree diagram showing all possible results when four fair coins are tossed. Then list the ways of getting the indicated result.exactly two tails

A. hhtt, htht, htth, thht, thth, tthh, ttht B. hhtt, htht, htth, thht, thth, tthh C. hhtt, htht, htth, thth, tthh D. tthh

Determine a window which gives a complete graph of the polynomial function.f(x) = 4.5x3 + 12x2 - 82

A. [-2, 8] by [-250, 150] B. [-100, 100] by [-10, 10] C. [-6, 6] by [-50, 100] D. [-5, 5] by [-200, 50]

Solve the problem.The focal length f of a lens with index of refraction n is  = (n - 1) where R1and R2 are the radii of curvature of the front and back surfaces of the lens. Express f as a rational expression.

A. f = 
B. f = 
C. f = 
D. f =