8x+2y=-2
y=-5x+1
solve for x and y

Given f(t) = 282 - 53 +1, determine the function value f(2). do not include f(z) = in your answer

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)

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?