sorry im not sure if this is right sorry if i am wrong
ok to start off i'm pretty sure you meant to put (3x^2) rather than 3x^3, but i'll just ignore that part, so we first want to remove the parentheses and we add 6x^2-5x+3+3x^2+7x-8 so, we simplify and get: 9x^2+2x-5.
which is c.
if this mark me brainliest, and hit button!
23 child tickets were sold
using the information given, we can set up an equation to solve for the number of child tickets sold. since there were three times as many adult tickets as child tickets sold, we can assign the variable 'x' to represent the number of child tickets and '3x' to represent the number of adult tickets. since we know the cost of each ticket, as well as the total sales, we can set up the following equation:
5.20x + 9.70(3x) = 788.90
simplify 5.20x + 29.1x = 788.90
combine like terms: 34.3x = 788.90
divide both sides by 34.3: x = 23 child tickets