- Enable means on or off?

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I need help with an algebra question? Which function is a quadratic function?
a t(x)=(x-4)^2+3
b q(x)=(2x+4)^3+3
c r(x)=(-6x-4)^4+3(x+2)^2
d s(x)=-(x-6)+3(x+1)? Complete combustion of 8.70 g of a hydrocarbon produced 26.7 g of CO2 and 12.7 g of H2O. What is the empirical formula for the hydrocarbon? Calculate the moles of O in 0.180 mole C6H14O.? The scores of students had a normal distribution with μ=548.6 and σ=28.4
(a) What's the prob. that a student's test scores 555 or higher?