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3 years ago

Find the value of n in the equation 6.2n – 3.7n = 85 + 45.

Mathematics

2 answers:

Hoochie [10]3 years ago

8 0

Answer:

D. 52

Step-by-step explanation:

Add 85 and 45 to get 130.

6.2n-3.7n=130

Subtract 3.7 from 6.2

2.5n=130

divide 130 by 2.5 to find n

N=52

Paha777 [63]3 years ago

3 0

2.5n=130
n=52
Answer is D. 52

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Answer:

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Step-by-step explanation:

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b) To find area of one lateral surface:

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Using equation (1) to find the area:

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c) To find the lateral surface area:

We know that there are 3 lateral surfaces with equal height and equal base.

Hence, their areas will also be same. So,

$\text{Lateral Surface Area = }3 \times \text{ Area of one lateral surface}\\\Rightarrow 3 \times 24 = 72 mm^{2}$

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Total Surface area of the given triangular pyramid will be equal to <em>Lateral Surface Area + Area of base</em>

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b) Area of one lateral face = $24\ mm^{2}$

c) Lateral Surface Area = $72\ mm^{2}$

d) Total Surface Area = $87.6\ mm^{2}$

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