Solve this using algebra formulae

(√5a+ 2✓3b)²​

Which problem could be  solved  by evaluating the expression  7×(−3)7×-3?

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online