What is the value of x?

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Which of the following expressions is equal to 2x^2+8

Yvaries directly as x. y =90 when x=6. find y when x=13

At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.