The function is even with a negative leading coefficient. Even means the tails both go the same way, negative means they both go down.
You do cross multiplication so multiply 29 by 38 and then divide it by 78 which gives you answer of 14.128 cm
First subtract three from both sides. then you have

+2x=-3 and you solve from there
4a + 5a - 15 = 2 + 3a
6a = 17
a = 17/6
450 is the answer for the questions