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Mathematics 9 Online
mikewwe13:

Beth purchased a computer, and its value depreciated exponentially each year. Beth will sketch a graph of the situation, where x represents the number of years since she purchased the computer, and y represents its value that year. Beth will only sketch the graph in the quadrant or quadrants for which it makes sense to. In which quadrant or quadrants will Beth sketch the graph? A. Quadrants I, II, III, and IV B. Quadrants I and II only C. Quadrants I and IV only D. Quadrant I only

mikewwe13:

@Vocaloid

Vocaloid:

Hint: can price or time be negative?

mikewwe13:

no

Vocaloid:

Good so what quadrant can we use?

mikewwe13:

C.

Vocaloid:

Which quadrant only has positive x and y valueS?

mikewwe13:

OH MY MISTAKE it was D

mikewwe13:

only D

Vocaloid:

Good

mikewwe13:

Alisa buys a watermelon every year. The first time she bought a watermelon, in Year 0, it cost $2.50. She notices the price is getting more expensive, at a rate of 3% per year. Alisa sketches a graph of the situation. Which statements are true? Select each correct answer. The graph increases from left to right. The point ​ (0,2.50) ​is on the graph. The graph has an x-intercept and a y-intercept. The graph decreases from left to right. The point (2.50,0) is on the graph. The graph has a y-intercept but no x-intercept.

mikewwe13:

my answers B, A, and D correct me

Vocaloid:

try graphing y = 2.50(1.03)^x

mikewwe13:

|dw:1509637085869:dw|

mikewwe13:

it's loading

mikewwe13:

it's straight line to 2

Vocaloid:

Hold on, people in the chat are being difficult again :(

mikewwe13:

i've figured it out C AND D and E

mikewwe13:

OH OK

Vocaloid:

http://www.wolframalpha.com/input/?i=y+%3D+2.50(1.03)%5Ex

Vocaloid:

there's a y-intercept but no x-intercept

mikewwe13:

ok that's D

Vocaloid:

the graph increases, has (0,2.50) as a point, and has a y-intercept but no x-intercept anyway, that's your solution, g2g and have a nice day

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