Start with the x intercepts.
You need to factor the original function.
y = x^2 - 4x - 21
y = (x - 7)*(x + 3) These are the correct factors.
The two roots are
x = 7
x = - 3
So the two points you want are (7,0) and (-3,0)
That makes the answer C <<<<========
The vertex is a little harder. You need to complete the square to get it. (I take it you don't know any calculus yet.
y = x^2 - 4x - 21
y = (x^2 - 4x + ... ) - 21
y = (x^2 - 4x + 4) - 21 - 4
y = (x - 2)^2 - 25
The vertex is (2,- 25)
The answer is B <<<<<<=======
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❖ The sales tax rate is 5%.
In order to get 5%, you divide 1/29 ÷ 25.79. Basically, dividing the x by the y.
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3.50x + 5 < 30
Ellie wants to spend less than 30, so it’ll be less than.
Pythagoras tells us that the diagonal is √(9²+40²) = 41.
Answer C.