Your friend enters a contest to
see how many seconds they
can
stay standing on a beam
without falling off. The first day
they stand 2 seconds.
seconds. Each day
after the first, they stand twice as
long. How many days is it until they
can stand more than 1/2 hour?
A) 6
B) 4
C) 11
D) 10

I answered in a comment explaining it but it would be for days

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !