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nordsb [41]
3 years ago
10

How do you find surface area (just the basis)?

Mathematics
1 answer:
Leokris [45]3 years ago
6 0
To find surface area of 3D objects, you have to know the area formulas for basic shapes. For example, the area of a circle is \pi r^{2} and the area of a rectangle is length times width. To find surface area of a cylinder, you will need to know both of those formulas, since the 3D shape involves both circles and rectangles.
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1) Omar has scored 85, 71, and 77 on the first three exams in his math class. If the standard 70,80,90 scale is used for grades
Rus_ich [418]

Answer:

a. 47

b. 87

c. 127

Step-by-step explanation:

Assume a total of 4 exams ( first 3 plus a final)

Let final score be X,

Hence,  average score = (85 + 71 + 77 + x) / 4 = (233 + x) / 4

a) to get a C, the average score must be 70

70 = (233 + x) / 4

(233 + x) = 70 (4) = 280

x = 280 - 233 = 47 (Ans)

b) to get a B, the average score must be 80

80 = (233 + x) / 4

(233 + x) = 80 (4) = 320

x = 320 - 233 = 87 (Ans)

c) to get a A, the average score must be 90

90 = (233 + x) / 4

(233 + x) = 90 (4) = 360

x = 360 - 233 =  127 (Ans)

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For Y=2x+10 X=y/2 -5. Second x/3
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2 years ago
Why is the solution of 3x + 5 = 2x - 7
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Answer:

Use pemdas

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