Let u = (5, -7) and v = (2, 1). What is u · v?
-2
1
3
17

B: 3

Step-by-step explanation: did on edge

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: