R; all quadratic functions are going to have ranges and domains of *ALL REAL NUMBERS* [(-∞, ∞)].
Infinitely many because if you subtract 7x from both sides, you get 4 = 4, which is true at all times no matter what x is.
He burned 603.9 more calores today than yesterday
Step-by-step explanation:
<u>Step 1: Substitute x from the second equation into the second one</u>







<u>Step 2: Substitute y into the second equation</u>




Answer: 
Answer: 48 millas por hora
Step-by-step explanation: 40t + 2= 60t - 3, es t = .25.
la distancia de su casa a su trabajo es 40(0.25 +0.05) =12 millas allí para su velocidad promedio debería ser 12/0.25 = 48 millas por hora