Question

Help pleaseeeeeeeeeeeeeee and explain your answer

Answer 1

Answer: You are correct. It is choice A.

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Step-by-step explanation:

This is assuming the grapes are charged on some kind of weight basis, eg: charged per pound.

Let's say it costs $0.70 per pound, ie 70 cents per pound.

If x is the weight and y is the cost, then the equation would be y = 0.70x. The slope here is 0.70 to represent the rate of change. Each time x goes up by 1, y goes up by 0.70; meaning that each time you add a pound of grapes, the cost goes up by 70 cents.

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Side notes:

• Choice B can be ruled out because the temperature is not changing at a constant rate. Also, the temperature doesn't always increase, or always decrease. We have the temperature fluctuating up and down.
• Choice C is a similar story to choice B. The bird's height won't always go up or go down. So we can't say the rate of change is constant.
• Choice D will depend on how popular the game is. If popularity is high, then ticket sales is likely to sharply increase as the kickoff time approaches. On the other hand, if the game isn't popular, then ticket sales would level off and then approach 0 at some point. In either event, we don't have a constant rate of change. So we can rule out choice D along with the other choices B and C.

Answer 2

A. The cost of a bunch of grapes compared with its weight

Step-by-step explanation:

A. The cost of a bunch of grapes compared with its weight

Step-by-step explanation:

We are required to find the situation which shows a constant rate of change.

According to the options, we have,

D. The number of tickets sold compared to the number of minutes before a football game

In this case, we see that, the rate of change between the number of minutes and the number of tickets sold may vary and need not be constant.

B. The outside temperature compared with the time of day

Here, the temperature changes with different values throughout the day and this case will not give a constant rate.

C.The height of a bird over time

The height of the bird over a time would not give a constant rate.

Further, we have that,

The cost of a bunch of grapes compared with its weight will always give a constant rate as whenever the weight changes, the cost will change accordingly.

So, the correct answer is A