Answer:
x = 1 ⇔ y = -2.4
x = 2 ⇔ y = -1.8
x = 3 ⇔ y = -1.2
x = 4 ⇔ y = -0.6
Step-by-step explanation:
→ Rearrange to make y the subject
→ Multiply everything by -1
→ Divide everything by 5
⇒ Substitute x = 1, 2, 3 and 4
HELP ME 7th grade mathWhat is the total surface area?
1 answer:
Answer:
Step-by-step explanation:
To calculate the total surface area, you first need to calculate the surface area of one of the 4 triangles and multiply that by 4.
We can solve this two ways (I would recommend using 2).
1)
Using herons formula:
a, b, c = different sides of the triangle (length)
s = (a + b + c) / 2
a =
If we input values:
a = b = c = 6.5m
s = (3 * 6.5) / 2 = 9.75
which is about 18.29478 (exact answer:
)
18.29478 * 4 = the entire area = 73.17912 m^2
exact whole area:
2)
Each of the four triangles can be divided into 2 more triangles.
(2 * 4 = 8 = total amount of new small triangles)
How we calculate the area of one of the new small ones:
(h * w) / 2 = a
h = 5.6m
w = (width of one of the four triangles width divided by 2) = 3.25m
3.25m * 5.6m = 18.2m^2
18.2m^2 / 2 = 9.1m^2
There are 8 of the new small triangles in the biggest triangle made up of four smaller ones.
So if we take 9.1m^2 * 8, we get the total area!
Total area: 72.8m^2
Happy to help you!
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Have a good day! (●'◡'●)
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