Answer:

Step-by-step explanation:
The appropriate trig identity is ...

Here, you have a scale factor of 6 and a=3θ, b=θ. Filling in these values gives ...

Answer:
For the first question, he would raise $38.
Step-by-step explanation:
1 x 12 = $12
2 x 13 = $26
12 + 26 = $38
381 1/10- 214 43/100= 166 67/100
20X0.3= 6
30X0.3= 9
40X0.3= 12