5r3 – 40
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9×2 + 12x + 4
9×2 + 12x + 4
a2 – 4ab – 21b2
a2 – 4ab – 21b2
2×2 + 23x + 11
2×2 + 23x + 11
Add or subtract as indicated.6 – 11 + 2
Add or subtract as indicated.6 – 11 + 2
64-4/3
64-4/3
(x + 5)(x + 6)
(x + 5)(x + 6)
5x + 35 + xy + 7y
5x + 35 + xy + 7y
+ 3 + 3
+ 3 + 3
Solve the problem.A formula for the focal length of a lens i…
Solve the problem.A formula for the focal length of a lens isf = Calculate f (the focal length) for a = 20 cm and b = 13 cm. Round to the nearest tenth of a centimeter when necessary.