Z varies jointly as x and y and inversely as w. if z = 16 when x = 5, y= 4 and w =10, find z when x =6, y = 8, and w = 12 help

What is the product of the radical expression. (7-2square root) (8+2 square root)

Asalesperson earns $320 per week plus 8% of her weekly sales. the expression representing her earnings is 320 + 0.08x. which of the following describes the sales necessary for the salesperson to earn at least $1000 in the one week?

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)