Julie is x years old
david is 3 years older than julie
omar is twice as old as david

write an expression for the sum of julie, david and omar's ages

J=x
d=3+x
o=2d, o=2(3+x)=6+2x

j+d+o=x+3+x+6+2x=4x+9

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?

I'm not sure sorry that i couldn't