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kenny6666 [7]
3 years ago
14

20. A rectangle has an area of 45 cm². The length is one cm less than twice the width. Find the dimensions of

Mathematics
1 answer:
prohojiy [21]3 years ago
7 0
Width = 5, length = 9

Area = length * width

length = (2 * width) - 1

sub equation for length

45 = (2w - 1) * w
45 = 2w^2 - w
2w^2 - w - 45 = 0
(2w - 9)(w - 5)
2w - 9 = 0
w = 9/2, l = 8 no

w -5 = 0
w = 5, l = 9 yes
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Cara evaluated the expression below.
s2008m [1.1K]

Answer:

Cara  multiplied only 4 and 7 together and did not multiply 4 and 13.

Step-by-step explanation:

Let us evaluate the given expression step by step,

\frac{4(7-13)}{3} +(-4)^{2} -2(6-2)\\

We can evaluate this expression in two ways; either by subtracting -13 from 7 and then multiply by 4 or by multiplying 4 to 7  and -13.

\frac{28-52}{3} +16-2(4)

\frac{-24}{3} +16-8

-8+16-8=-16+16=0

Now let us see where Cara made an error. We can see Cara just multiplied only 4 and 7 together and did not multiply 4 to 13.

Therefore, Cara made error in her first step.

5 0
3 years ago
Read 2 more answers
quentin has 18 unit cubes how many diffrent rectangular prisims can he build if he uses all of the cubes
tigry1 [53]
1.)  18 in. by 1 in.  2.)  18 in. by 1 in.  3.)  2 in. by 9 in. 4.) 9 in. by 2 in. 5)  6 in.by 3 in. 6.)   3 in. by 6 in. 
There are 6 shapes. I hope this helped. 

7 0
3 years ago
Simplify.<br><br> [3 • (3 – 9)] + 9
Marat540 [252]

Answer:

(9-27)+9

=-18+9

<em><u>=-9</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>answer</u></em>

4 0
3 years ago
Simplify 4.836 divided by 1.2​
MrRissso [65]

Answer:

4.03 is your answer.

Step-by-step explanation:

4.836 divided by 1.2​

4.836/1.2 = 4.03

4.03 is your answer.

8 0
3 years ago
Read 2 more answers
9) State the coordinates of the endpoints of a<br> line segment that intersects the y-axis.
eduard

Answer:

(5,4) and (3,4)

Step-by-step explanation:

A line segment has 2 end points which can be denoted as:

(x_1,y_1) and (x_2,y_2)

When this line segment intersects at y.

This means that the coordinate on the y axis is the same at both end points

i.e.

y_1 = y_2 = y

(x_1,y_1) and (x_2,y_2) becomes (x_1,y) and (x_2,y)

x1 and x2 can be any value but the y value must remain unchanged

Using the above analysis, a possible coordinate is:

(5,4) and (3,4)

Note that there are as many answers as possible as long as the coordinate pair satisfy is of the form (x_1,y)<em> and </em>(x_2,y)<em />

Take for instance, another possible pair is:

(1,-3) and (0,-3)

7 0
3 years ago
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