Simplify the following algebraic expressions:
-2(x-2b+1/2)
possible answers:
a) 2x-4b+1
b) 2x+4b-1
c) -2x-4b-1
d) -2x+4b-1

What is the value of 1/3x + 7x when x = 5

What is the length of the unknown leg in the right triangle ?

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)