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jasenka [17]
3 years ago
8

I don’t understand can you please explain how you got this answer my answer keep being low than these

Mathematics
1 answer:
disa [49]3 years ago
3 0

Answer:

189

Step-by-step explanation:

The pyramid has four triangular faces and a square base.

The area of a triangle is half its base times its height.  The base of each triangle is 7, and the height of each triangle is 10.  So the area of each triangle is A = ½ (7) (10) = 35.

The area of a square is the side length squared.  The side of the square is 7.  So the area of the square is A = (7)² = 49.

The total surface area is:

A = 4(35) + 49

A = 189

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The GCF of 18 and 27 is _______.
Gnoma [55]

Answer:

9

Step-by-step explanation:

The factors of 18 are : 1, 2, 3, 6, 9, 18

The factors of 27 are : 1, 3, 9, 27

The common factors are : 1, 3, 9

The gcf is 9

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3 years ago
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Step-by-step explanation:

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I keep getting this wrong and I only have one chance to get it right. Please help! It's timed aswell.
allsm [11]

PIC 1 - floor function

PIC 2 - 1,1

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2 years ago
6. Andre and Elena are each saving money. Andre starts with $100 in his savings account and adds $5 per week. Elena starts with
lora16 [44]

You need to write an equation for each.

For Andre, he has 100 dollars, and every week gets 5 dollars more. You add the 5 dollars, and Since you don't know how many weeks it has been, use a variable.

100 + 5w

For Elena, she has 10 dollars, and gets 20 each week.

10 + 20w

Now that you know that it has been 4 weeks, you can plug in 4 for the variable for weeks.

Andrew:

100 + 5(4) = 100 + 20 = 120

Elena

10 + 20(4) = 10 + 80 = 90

Andrew has more money in this time.

To find when they have the same amount, equal their expressions to each other. This means that they will have the same amount (because they are equalled) and you can solve to find the variable, which means the weeks that they are equal at.

Bring the like terms to each side by canceling them out. Since you have positive 10, then subtract 10 to each side. You have 5w, so subtract 5w to each side.

100 + 5w = 10 + 20w \\ 90 + 5w = 20w \\ 90 = 15w \\ 90 \div 15 = 6 \\ 6 = w

The answer will simplify down to 6 weeks.

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