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Allisa [31]
3 years ago
8

Please explain how to do this, thank you.

Mathematics
1 answer:
Rzqust [24]3 years ago
4 0

The graph shows a parabola with vertex at (0,9). It opens down. This is sufficient info with which to write a quadratic equation for temperature as a function of time: T(t) = -t^2 + 9.


It happens that we want to know the times at which T=8 degrees F. To do this, set T(t) = -t^2 + 9 = to 8 and solve for t:


-t^2 + 9 = 8, or 1 = t^2., or 9 - t^2 = 8.


While we were not asked to find these times, doing so is easy: t = plus or minus 1.

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I need help with this.
leonid [27]
You are basically just comparing the ratios (the ratios will have to be the same for both for it to be the correct answer)
so for choice A you would do:
116.5cm:845km =0.14
174cm:1160km=0.15
these are not equal so it would not be correct

the correct answer would be B because:
42.25cm:845km=.05
58cm:1160km=.05
5 0
4 years ago
Which would be the best way of describing the structure of Thoreau’s observations in "Civil Disobedience"?
sveta [45]
The question needs choices. Once the choices be presented that's the time the question will be answerable.
8 0
3 years ago
Read 2 more answers
What method can you use to find the area of the composite figure? Select three options.
zheka24 [161]

Answer:

Step-by-step explanation: We can draw a vertical line segment from the smaller section of the rectangle straight down. This would cut the rectangle into 2 smaller rectangles. We can then find the area of each rectangle and add them to find the area of the composite figure.

6 0
3 years ago
Bill plays a game of a chance at school fair.
myrzilka [38]

Answer:

well... this normal addition

Step-by-step explanation:

9+8=17

9+1=10

5+4=9

5+2=7

3+4=7

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4 0
3 years ago
A student in a wildlife biology class wants to determine the abundance of a rodent species in a local nature preserve, divided i
LekaFEV [45]

Answer:

c. Cluster sampling

Step-by-step explanation:

Taking into account that the exercise researcher is looking with limited resources to study a population that is divided, her best option is cluster sampling, which is a method applicable to this type of population, we could select in each group randomly her sample, the observational study is discarded because she does not have much availability of time or resources, nor would the stratified study be useful because she should select subgroups and create them to take samples and this would take more time and resources and sampling systematic is not adequate because it must have all the individuals and after having the list select the sample, but as we know, it is a process that will study the number of individuals so this option is not feasible.

5 0
3 years ago
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