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2 years ago

Sarah has two similar rectangular boxes. The dimensions of Box 1 are four times those of Box 2.

Mathematics

2 answers:

Elena-2011 [213]2 years ago

4 0

Answer: 16

Step-by-step explanation:

an area is always calculated by multiplying 2 dimensions.

when changing the dimensions, then the change factors for EACH dimension go into the calculation too.

therefore, when both dimensions of an area are enlarged 4 times, then the area is enlarged 4×4 = 16 times.

this just propagates to the whole surface area of an object, as each individual area of the overall surface area is enlarged by the same factor. and so, the sum of all the individual areas (= altogether the surface area of the object) is also enlarged in total by the same factor.

just think

16×a + 16×b + 16×c ... = 16×(a+b+c+...)

Inga [223]2 years ago

4 0

Answer: is 16 I’m not totally for sure tho..

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How many posible solutions for x-3y=-3 and -2x+6y=12

Alexus [3.1K]

Answer:

there are no solutions

Step-by-step explanation:

x-3y=-3

-2x+6y=12

multiply the first equation by 2

2( x-3y)=-3*2

2x-6y = -6

add the 2 equations together

2x-6y = -6

-2x+6y=12

-------------------

0 = -6

this is not true

so there are no solutions

7 0

2 years ago

Find the measure of angle BCD in the following parallelogram. what's does BCD equal

DiKsa [7]

Answer:

120 degrees

Step-by-step explanation:

This is a quadrilateral, and by definition, the sum of all the interior angles is 360. So, we can just sum up all the expressions and set them equal to 360:

2x + x + 2x + x = 360

Combine like terms and solve for x:

6x = 360

x = 360/6 = 60

<BCD = 2x = 2 * 60 = 120

Thus, the answer is 120 degrees.

Hope this helps!

4 0

3 years ago

Write an expression for 20 times the sum of 4 and 2

marta [7]

Answer:

20x6

Step-by-step explanation:

20x (x stands for multiply/times)

6(sum/add 4+2)

20x6

Hope this helps.

8 0

2 years ago

Read 2 more answers

The function C(x) = 25x + 50 represents the labor cost (in dollars) for Certified Remodeling to build a deck, where x is

Whitepunk [10]

Answer:

Master Remodeling

Step-by-step explanation:

<em>Original question is attached</em>

<h3>Option 1</h3>

C(x) = 25x + 50
C(8) = 25*8 + 50 = $250

<h3>Option 2</h3>

As per table, the rate of change is $30 per 2 hours.
So 8 hours will cost
$190 + $30 = $220

As we see the second option is cheaper so we should hire the Master Remodeling

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2 years ago

Evaluate 2.5(8.6/2)-1.8

777dan777 [17]

Step-by-step explanation:

Given the expression:

$2.5( \frac{8.6}{2} ) - 1.8$

Follow BODMAS rule.

always evaluate brackets first, followed by multiply or division then addition or subtraction from LEFT to RIGHT.

$2.5( \frac{8.6}{2} ) - 1.8 \\ = 2.5(4.3) - 1.8 \\ = 10.75 - 1.8 \\ = 8.95$

3 0

2 years ago