there are 40 pupils in a class. there are x more girls than boys. how many boys are there in terms of z.​

Asmall foreign car gete 42 miles per gallon and user 35 gallons on a trip.gasoline costs $1.05 per gallon.what was the cost of gasoline per mile driver?

What is the expression in factored form? 225x^2 - 144 a. 9(5x+4)^2 b. 9(5x-4)^2 c. 9(4x+5)(4x-5) d. 9(5x+4)(5x-4)

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?