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Lostsunrise [7]
2 years ago
12

Help me do this question i need help

Mathematics
1 answer:
poizon [28]2 years ago
6 0

Answer:

<em>P = 35 cm</em>

Step-by-step explanation:

<u>Rectangles</u>

Being x and y the dimensions of a rectangle, the perimeter can be calculated as:

P = 2x + 2y

The smaller rectangles of the figure have a width of x cm. We don't know the value of the length, but we can see how the two smaller horizontal rectangles' widths complete the height of the vertical rectangle. Since all the rectangles are identical, then the height of each rectangle is

y = 2x

Substituting in the formula and knowing the perimeter is 21:

2x + 2(2x) = 21

6x = 21

x = 21/6 = 7/2 = 3.5

The large rectangle has a width of 2x and a length of y+x = 3x, thus the perimeter is:

P = 2(2x) + 2(3x) = 4x + 6x = 10x

Since x=3.5 cm:

P = 35 cm

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Hey!

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2LH:

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2WH:

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Surface Area:

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Answer:

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What will be the units of the square of the following <br>a - 2346<br>b - 5677​
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<h2>Answer:</h2>

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<h2>Step-by-step explanation:</h2>

The units of a whole number is the rightmost digit in the number. For example, if the number is <em>15678</em>, the units is <em>8</em> since that is the rightmost digit. Another example is <em>25795</em>. The units is <em>5.</em>

<em></em>

(a) To find the units of the square of -2346,

<em>i. First find the square of (-2346)</em>

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<em>ii. Now find the rightmost digit.</em>

The rightmost digit of 5503716 is 6.

<em>Therefore, the units of the square of (-2346) is </em><em>6</em>

<em />

<em />

(b) To find the units of the square of -5677,

<em>i. First find the square of (-5677)</em>

(-5677)² = (-5677) x (-5677) = 32228329

<em>ii. Now find the rightmost digit.</em>

The rightmost digit of 32228329 is 9.

<em>Therefore, the units of the square of (-5677) is </em><em>9</em>

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