7x - 1 + 6x - 1 = 180
13x - 2 = 180
13x = 182
x = 14
12a. First expressing as a fraction, Shan has 12/32 books from his favorite author, so:
12/32=3/8=0.375 books from his favorite author
12b. Because the decimal 0.375 isn't a periodical decimal, so it would be a terminating decimal.
If i understood the question right, you're trying to find the value when h = -2. If that's true so here is how it's done:

To determine this, we need to multiply 8 by 36 and 3 by 4 to get the total area.
8 x 36 = 288
3 x 4 = 12
Subtract the two to get the total area she is painting.
288-12 = 276
Your total area is 276 sq ft.
Your answer is D.)
I hope this helps!
Answer:
2 3/10, 2.59, 24
Step-by-step explanation: