Can yall help me with the Manipulating Systems of Equations Quick Check

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

What number line represents the solution set for the inequality -1/2 greater than or equal to 4

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x