Rewrite the expression by collecting like terms. 1/3n - 2/8n I don’t understand any of my work right now so ima just ask y’all for help.

Which of the following contains a variable?

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)

Hassan bought a package of tofu. the temperature of the tofu was 14° celsius when hassan put the package into the freezer. he left the tofu in the freezer until it reached –19° celsius. which expressions explain how to find the change in temperature, in degrees celsius, of the package of tofu? select three that apply.