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3 years ago

What is the surface area of a triangular pyramid if each face has an area of 30mm squared?

2 answers:

7 0

A triangular pyramid has 4 triangles
3 are sides
1 is th base
they are normally all the same area
if 1 is 30
3*4=120
yah, 120mm squared is answer

netineya [11]3 years ago

3 0

I hope this helps you

3 triangles area+square area

3.30+30

90+30

120

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What is 3 to the 6 power over 3 to the 10 power times 3 to the 1 power equal

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Answer:

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Step-by-step explanation:

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3 years ago

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140 fluid ounces increased by 45%

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3 years ago

It takes 41 minutes for 9 people to paint 9 walls. how long does it take 14 men to paint 14 walls

denis23 [38]

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3 years ago

Help please.......Write a system of equations to describe the situation below, solve using any method, and fill in the blanks.

maxonik [38]

Answer:

The cost of 1 dozen doughnut is $6 and the cost of a dozen croissant is $10.

Step-by-step explanation:

We know that:

D = Cost of a dozen doughnut
C = Cost of a dozen croissant
10D + 7C = 130
6D + 4C = 76

Work:

10D + 7C = 130

6D + 4C = 76

4(10D + 7C = 130)

7(6D + 4C = 76)

40D + 28C = 520

42D + 28C = 532

40D - 42D = 520 - 532
=> -2D = -12
=> 2D = 12
=> D = 6

Now, let's substitute the value of D into the first equation.

10D + 7C = 130
=> 10(6) + 7C = 130
=> 60 + 7C = 130
=> 7C = 70
=> C = 10

Hence, the cost of 1 dozen doughnut is $6 and the cost of a dozen croissant is $10.

Hoped this helped.

$BrainiacUser1357$

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2 years ago

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aalyn [17]

3(3x9)

3x3=9
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3 years ago

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