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Charra [1.4K]
3 years ago
12

Please help quick due in 20 mins

Mathematics
2 answers:
koban [17]3 years ago
6 0

Answer:

step 1. 8.1 = a + 2.4

step 2. a = 8.1 - 2.4

step 3. a = 5 7.

IrinaK [193]3 years ago
3 0

Answer:

5.7 I pretty sure

Step-by-step explanation:

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All members of a construction crew work at the same pace. Four of them working together can pour a foundation in 32 hours. How m
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Read 2 more answers
In a building there are 30 cylindrical pillars. The radius of each pillar is 42 m and height is 7 m. Find the total cost of pain
SashulF [63]

Answer:

The total cost of painting the curved surface area of all pillars at the rate of Rs 10 per square meter is Rs.554400.

Step-by-step explanation:

Given : In a building there are 30 cylindrical pillars. The radius of each pillar is 42 m and height is 7 m.

To find : The total cost of painting the curved surface area of all pillars at the rate of Rs 10 per square meter ?

Solution :

Radius of each pillar r= 42 m

Height of each pillar h= 7 m

The curved surface area of each pillar is CSA=2\pi rh

Substitute the value,

CSA=2\times \frac{22}{7}\times 42\times 7

CSA=1848\ m^2

Area of 30 pillars is given by,

A=1848\times 30=55440\ m^2

The curved surface area of all pillars at the rate of Rs.10 per square meter.

The cost painting is C=55440\times 10=Rs.554400

Therefore, the total cost of painting the curved surface area of all pillars at the rate of Rs 10 per square meter is Rs.554400.

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