For all functions of the form f(x) = ax2 + bx + c, which is true when b = 0?
the graph will always have zero x-intercepts.
the function will always have a minimum.
the y-intercept will always be the vertex.
the axis of symmetry will always be positive.

The correct answer is:

The y-intercept will always be the vertex.

Explanation:

The vertex is found by first finding the axis of symmetry, using the formula

x = -b/2a

If b = 0, this gives us

x = 0/2a = 0

This means the point (0, c) will be the vertex.  This is also the y-intercept.

c

Step-by-step explanation:

i just took the test on e2020

b.) 160 miles on a 5 gallons car

step-by-step explanation:

240/10=24 miles/gallon

160/5=32 miles/gallon

30/1=30 miles/gallon

168/6= 28 miles/gallon

32 miles/gallon is the most amount, so this is the best.