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1. Oscar entered y=−0.4^x+3 into an online graphing tool.

What function did he graph?

A. y=(−0.4)x+3

B. y=−(0.4)x+3

C. y=−(0.4)x+3

D. y=(−0.4)x+3

2. Cedric buys a cantaloupe every week. The first time he bought a cantaloupe, it cost $2.40. He notices the price is getting less expensive, at a rate of 8% per week.

Cedric sketches a graph of the situation, labeling the y-intercept and the point representing the price on Week 4.

Which statements are true?

Select each correct answer.

A. The point (4, 3.27) is on the graph.

B. The graph increases from left to right.

C. The graph decreases from left to right.

D. The point ​ (4, 1.72) ​ is on the graph.

E. The graph has a y-intercept only.

The graph has an x-intercept and a y-intercept.

3.
When an experiment began, the temperature of a substance was −5°C. During the experiment, the temperature rose exponentially. The scientist will sketch a graph of the situation, where x represents the time after the experiment began, and y represents the temperature of the substance at that time.
The scientist will only sketch the graph in the quadrant or quadrants for which it makes sense to.

In which quadrant or quadrants will the scientist sketch the graph?

A. Quadrants I and II only

B. Quadrant I only

C. Quadrants I, II, III, and IV

D. Quadrants I and IV only

Respuesta :

ZavierL
___Brainliest if helped

1.He plotted y= -(0.4^x)+3 
He did not bracket properly so this is the graph. 

2.
C. The graph decreases from left to right.
D. The point ​ (4, 1.72) ​ is on the graph.
E. The graph has a y-intercept only.

D. Quadrants I and IV only 
Imagine a J shape from quad 4 extend to quad 1. 

Answer:

1.  y = -(0.4^x)+3 

2. C and E

3. D

Step-by-step explanation:

1.  y = -(0.4^x)+3 

Exponentials goes first, so the first operation is 0.4^x; then goes multiplication, that means the next operation is (-1)*(0.4^x); and finally goes the addition

2. y-intercept: (0, 2.4)

slope: -0.08

function: y = -0.08*x + 2.4

where y  is the price and x  are the weeks

C. The graph decreases from left to right. -> negative slope

E. The graph has a y-intercept only. -> all equations of a line has only one y-intercept

3. D. Quadrants I and IV only 

y-variable starts at a negative value and x-variable can only assume values greater than zero

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