Let f be the height of the fir trees
Let p be the height of the pine trees

We know from the problem that
f + p = 21 and 4f = 24 + p
rearrange the 2nd equation to get p = 4f - 24 and substitute into the other equation

so...
f + 4f - 24 = 21
5f - 24 = 21
5f = 45
f = 9 - height of the fir tree

substitute back into the 1st equation
9 + p = 21
p = 12 - height of the pine tree

8 0

2 years ago

Can someone help me with this?

Mariulka [41]

Answer:

1) $4+5=9$ .

2) $2+(-6)=-4$

3) $-3+(-7)=-10$

4) $(-7)+3=-4$

5) $9+(-4)=5$

6) $-1+4=3$

7) $5+(-5)=0$

8) $-3+(-6)=-9$

Step-by-step explanation:

In the given number lines, rightarrows represent positive integers and leftarrows represent negative integers.

In first number line we have two rightarrows.

Rightarrow from 0-4 = 4

Rightarrow from 4-9 = 5

So, required sum is $4+5=9$ .

Similarly,

$2+(-6)=-4$

$-3+(-7)=-10$

$(-7)+3=-4$

$9+(-4)=5$

$-1+4=3$

$5+(-5)=0$

$-3+(-6)=-9$

8 0

3 years ago

A circular plate has a crack along the line AB, as shown below: A circular plate is shown. The center of the plate is labeled as

makkiz [27]

Well, since point A represents the center, and B represents a point on the outer line of the circle, segment AB would represent the radius, since the radius represents the length from the center to the outside of a circle

Hope this helps

8 0

3 years ago

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