Answer:
one hand comes off the bat
Let's say hmm let's use the figures in thousands, so
model A costs 90 + 4 per year, so... ok.. after "t" years, then the cost for model A is then 90 + 4*t, or
A = 90 + 4t.
now, model B is 70 + 10 per year, so,... after "t" years, model B is then
B = 70 + 10 * t, or
B = 70 + 10t.
if we were to assume A < B, namely the cost of A is less than B, what would the years be? namely, what's "t"?

after that period, then A becomes cheaper than B.
I need the picture in order to see what angle x is :)
There are 18 crayons
Explanation:
1 whole = 12 crayon
1/2 of 12 is 6
12+6=18
The area is 70in^2 because you find the area of the square without the missing piece then subtract area of missing piece from total