The Jurassic zoo charges $8 for adults and $4 for each child. The total bill for 90 people from a school trip was $448. How many adults and how many children went to the zoo?

Which values of p and q result in an equation with exactly one solution? px-43=-42x+q choose all answers that apply: a) p=-43 and q=-43 b) p=42 and q=43 c) p=43 and q=−42 d) p=42 and q=42