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IrinaVladis [17]
3 years ago
10

PLZ HELP URGENT!!! DUE TOMORROW

Mathematics
1 answer:
ladessa [460]3 years ago
5 0

Answer:

a2 + b2 + 2ab

x2 + y2 + z2 + 2xy + 2yz + 2xz

p2 + q2 + 2pq

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A cube with 2 inch sides is placed on a cube with 3 inch sides. Then a cube with 1 inch sides is placed on the 2 inch cube. What
Taya2010 [7]

Answer:

let's try the "Divide and Conquer" method, that is we break down the problem into pieces and solve each piece until we arrive at the answer.

the formula for the surface area of the cube is:

SA = 6s^2; s is the length of one side of the cube

for the 3-inch cube

SA = 6(3^2)

SA = 6(9)

SA = 54 in^2

note however, that the actual surface area is less the area occupied by the 2-inch cube place on the 3-inch cube, which is

A = s^2; since this is a square

A = 2^2

A = 4 in^2

the actual SA (aSA) therefore of the 3-inch cube is

aSA = 54 - 4 = 50 in^2

for the 2-inch cube

SA = 6s^2

SA = 6(2^2)

SA = 6(4)

SA = 24 in^2

to solve for the actual SA of the 2-inch cube, we subtract the area which is in contact with the 3-inch cube and the 1-inch cube

aSA = 24 - 2^2 - 1^2

aSA = 24 - 4 - 1

aSA = 19 in^2

for the 1-inch cube

SA = 6s^2

SA = 6(1^2)

SA = 6 in^2

the actual surface area is less the area in contact with the 2-inch cube

aSA = 6 - 1^2

aSA = 5 in^2

the surface area of the three cube tower will just be the sum of the aSA of the three cubes

SA = 50 + 19 + 5

SA = 74 in^2   ans

Step-by-step explanation:

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3 years ago
Colin invests £4300 into his bank account.
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To do this you need to do 4300 x 1.04 to the power of 3
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Solve the equation for<br> a. K = 4a+9ab
Elanso [62]
So try to isolate a by division and such
K=4a+9ab
we use reverse dstributive which is ab+ac=a(b+c) so
undistribute a
4a+9ab=a(4+9b)
k=a(4+9b)
divide both sides by (4+9b)
\frac{k}{4+9b}=a
a=\frac{k}{4+9b}
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3 years ago
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Jake is comparing the prices of two laundry service companies. Company A charges $20 per load and an additional $8 as service ch
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Answer:

...

Step-by-step explanation:

...

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Please help me. Thank you--
Lapatulllka [165]
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for the fifth: tick the last.
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