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vivado [14]
3 years ago
14

At Martin Nature Center, the park ranger was showing Mrs. Rhames' class a comparison of a tree's age and the diameter of the tre

e trunk in inches.
The ranger showed them one oak tree that was 1 year old. It had a trunk diameter of 4 inches. Another oak tree was 10 years old. It had a trunk diameter of 25 inches.

Assuming a linear equation fits the situation, what would be the equation of that line?
Mathematics
1 answer:
sdas [7]3 years ago
5 0
If x is the age and y is the diameter of the trunk, write the equation:
ax+b=y

We must solve for a and b with the given information.

If (x, y) is (1, 4), we have:

a+b=4

If (x, y) is (10, 25), we have:

10a+b=25

Multiply the first equation by 10 to get:

10a+10b=40

Subtract the second equation from this to get:

9b=25

Thus b=25/9.  a=4-25/9=11/9, so our equation is 11x/9+25/9=y.
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Evaluate -Z + 7.49 for Z = -7.1
luda_lava [24]
14.59

To solve, simply plug -7.1 into -Z. Since Z is negative in the equation, it will turn the Z that’s given to us into a negative. Since that Z is already negative, it will now become a positive since that’s what two negatives being multiplied make. This is what your problem will look like:

-(-7.1) + 7.49
7.1 + 7.49 = 14.59
3 0
3 years ago
A biologist tags 25 birds with a band on their foot and lets them go back into the wild. The next year 100 total birds are captu
mestny [16]

Answer:

We can estimate a population of 500 birds.

Step-by-step explanation:

We can estimate the total bird population using a rule of three with the information given:

If we find 5 birds with the foot band among 100 birds captured, how many birds there are in total if inicially we put foot bands in 25 birds?

5 birds with foot band -> 100 birds captured

25 birds with foot band -> X total birds

X * 5 = 25 * 100

X = 25 * 100 / 5 = 500 birds

We can estimate a population of 500 birds.

7 0
3 years ago
78% of students in the 7th grade
irina1246 [14]

Answer:

77

Step-by-step explanation:

percentage         Students

78%--------------     -273

100%--------------      ---X

(100x273)/78 = 350 students in class so

how many did  not pass?​

350-273 = 77 students not pass

6 0
3 years ago
Read 2 more answers
What is the x-value of point A?<br> -6<br> -4<br> -2<br> 4<br> 6<br> X<br> What’s the answer
olga nikolaevna [1]

Answer:

This is 8

Step-by-step explanation:

-6

-4

-2

4

6

8

6 0
3 years ago
The price of an item has been reduced by 5%. The original price was $20. what is the price of the item now?
Makovka662 [10]

Answer:

I think its 19

7 0
3 years ago
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