Please help me please

1. tan

2. standard

3. y=16.8

Step-by-step explanation:

1. Trigonometic functions are:

sinA=opposite/hypoteneuse

cosA=adjacent/hypoteneuse

tanA=opposite/adjacent.

We have the opposite side (20) and the adjacent side (y), but not the hypoteneuse, ao we have to use tan.

2.Inverse is only used when we dont know the angle measure, so we use standard.

3.tanA=opp/adj

tan50=20/y

1.19175359259=20/y

y=16.7819926235 or 16.8

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

(w – 2.5)(w + 2.5)

(–4v – 9)(–4v + 9)

step-by-step explanation: