Answer:
Step-by-step explanation:
The error is in the second step. For some unknown reason, the x was dropped and the 3 was subtracted from the 7.
It should be
9x +3x + 12 = 7
12x + 12 = 7 Subtract 12 from both sides.
12x + 12 - 12 = 7 - 12 Combine
12x = -5 Divide by 12
12x/12 = -5/12
x = -5/12 or x = - 0.4167
To multiply you have to distribute. 3(h-5) will be 3h-3(5) which is 3h-15. So the answer is 3h-15
Answer:
78
Step-by-step explanation:
Answer:
a) p = -84
b) m = 23
Step-by-step explanation:
p = -4
a = 19 + 2p
⇒ 19 + 2 x -4
⇒ -84
m = 3
- 4
⇒ 
- 4
⇒ 23
B. sinC= cosA
Remember SohCahToa.
The sine is equal to opposite/hypotenuse and cosine is equal to adjacent over hypotenuse.
The sine of C is 12/13 and the cosine of A is 12/13.
