-2a + 3 = 30-12 what does that equal ?

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18