3. The function A(t) = 99t describes the cost of Cell Phone Plan A (in dollars) for t months.
The table shows the cost of Cell Phone Plan B
for t months. Which plan will cost more for 6
months, and which function describes the cost
of Plan B?
t
1
2
3
B(t)
$150
$200
$250
A. Plan B; B(t) = 100t + 50
B. Plan B; B(t) = 50t + 100
C. Plan A; B(t) = 100t + 50
D. Plan A; B(t) = 50t + 100

y=3x+4

step-by-step explanation:

given the points a(0,4) and b(-4, -8)

eqn of line ab: (y-4)/(x-0)=(-8-4)/(-4-0)

(y-4)/x=-12/-4=3

y=3x+4

1.30

step-by-step explanation:

let's call the solutions x₁ = (5 - 2√7)/3 and x₂ = (5 + 2√7)/3

then the equation is (x-x₁)(x-x₂) = 0

if you fill that in you get a lot of numbers which you can recognize as ax²+bx+c=0.

step-by-step explanation:

you can see that a=1 (there is just an x²)

b = (-5 -2√7 + 2√7 - 5)/3 = -10/3

c = -2√7)/3 ) * (-5+2√7)/3) = -1/3

so your answer is 3x^2 – 10x – 1 = 0