I need help! ASAP!:(

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

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)

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10