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Anna71 [15]
3 years ago
8

Work out the surface area of the solid cuboid H=2cm W=4cm L=5cm

Mathematics
1 answer:
Nitella [24]3 years ago
6 0

Answer:

total surface area = 76 sq.cm

Step-by-step explanation:

total surface area of cuboid = 2 ( lb + lh + bh )

( where l is length , b is width and h is height )

so, surface area :

= 2[ (5×4) + (5×2) + (2×4) ]

= 2 [ 20 + 10 + 8 ]

= 2 × 38

= 76 sq.cm

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What is an equation of the line that passes through the point (−8,−1) and is parallel to the line x-4y=4x
avanturin [10]

Answer:

y = -3/4x - 7

Step-by-step explanation:

Parallel lines have the same slope.

Solve for y in the equation to find the slope.

x - 4y = 4x

  -4y = -x + 4x

  -4y = 3x

     y = 3/-4 x   = -3/4x    So the slope is -3/4  which is the coefficient of the

                                       x term

Substitute the slope(m) = -3/4 and point (-8, -1) into y = mx + b to solve for "b"

y = mx + b

-1 = -3/4(-8) + b

-1 = 6 + b

-1 - 6 = b

-7 = b

The equation of the new line:  y = mx + b

                                                  y = -3/4x - 7

5 0
2 years ago
A delivery person uses a service elevator to bring boxes of books up to an office. The delivery person weighs 140 lb and each bo
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Step-by-step explanation:

970-140= 830

830÷60=13.8333333333

5 0
3 years ago
Find the least common multiple of 20, 4, and 5
Salsk061 [2.6K]

Answer:

LCM = 20

Step-by-step explanation:

You need to make everything into 20. Luckily, 4X5 is 20 and vise versa.

4 0
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What will the width of the paper need to be
Natalka [10]

Answer:

the paper need to be 16 inches

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Theorem: The segment joining the midpoints of two sides of a triangle is parallel to the third side and half its length.
Taya2010 [7]

Answer:

Segment DE is half the length of segment AC. -- Substitution property of equality

Step-by-step explanation:

Here is given a proof for proving line joining mid segment is parallel and half the length of third side.

Stepwise proof is given in two columns

We find that for every line there is a justification as

STatement                                        Justification

D and E coordinates found out       MId point formula

DE and BC are measured                Distance formula

DE=1/2 BC                                          Substitution property of equality

This justification was missing in the given proof and with this included proof would be complete

4 0
3 years ago
Read 2 more answers
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