A) Original price : y =10.x
Cheaper brand : y = 7x
The original box is $3 more than the cheap one. Proof:
Suppose 1 box is bought of each (x=1),original will cos10 & the cheaper $7
b) Each time he buys a cheap brand he save $3 ($10-$7), on 5 cheap boxes, he would save $3 x 5 boxes = $15

4 0

4 years ago

A rocket is launched from a tower. The height of the rocket, y in feet, is related to the time after launch, x in seconds, by th

Iteru [2.4K]

Answer:

8.90 seconds

Step-by-step explanation:

When the rocket hits the ground, its height ( <em>y</em> ) will be zero. This means we can write the equation as:

0 = -16x²+129x+119

So we need to <u>solve that equation</u>:

a = -16

b = 129

c = 119

x = $\frac{-b\frac{+}{-}\sqrt{b^2-4ac} }{2a}$

x₁ = -0.84

x₂ = 8.90

We discard x₁, as it is negative.

So the answer is x₂, 8.90 seconds.

8 0

3 years ago

1) Which variable did you plot on the x-axis, and which variable did you plot on the y-axis?

Liula [17]

Answer:

Step-by-step explanation:

This question is too difficult

3 0

3 years ago