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makvit [3.9K]
3 years ago
15

HELP ME PLS I NEED TO PASS THIS TEST OR I FAIL 8TH GRADE

Mathematics
1 answer:
SVETLANKA909090 [29]3 years ago
7 0
<span>----
Solve for "x":
x + 4y = 24
x + 16 = 24
x = 8
-----------------
Solution: (8,4)</span>
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A rectangular lawn is 2 m longer than it is wide.
PtichkaEL [24]

Let's breadth be x

  • Length be x+2

ATQ

\\ \sf\longmapsto x(x+2)=21

\\ \sf\longmapsto x^2+2x=21

  • Use completing the square method

\\ \sf\longmapsto 4(x^2+2x)=4(21)

\\ \sf\longmapsto 4x^2+8x=84

\\ \sf\longmapsto (2x)^2+2(2x)(2)=84

\\ \sf\longmapsto (2x)^2+2(2x)(2)+2^2=2^2+84

\\ \sf\longmapsto (2x+2)^2=88

\\ \sf\longmapsto 2x+2=\pm\sqrt{88}

  • As it's dimensions we will take positive

\\ \sf\longmapsto 2x+2\approx 9.7

\\ \sf\longmapsto 2x=9.7-2=7.7

\\ \sf\longmapsto x=3.8

  • x+2=3.8+2=5.8

Now

\\ \sf\longmapsto Perimeter=2(L+B)

\\ \sf\longmapsto perimeter=2(3.8+5.8)

\\ \sf\longmapsto perimeter=2(9.6)

\\ \sf\longmapsto Perimeter=19.2m

  • Length of 1 strip=13m

Total strips

\\ \sf\longmapsto \dfrac{19.2}{13}

\\ \sf\longmapsto 1.47strips

  • She needs 2 strips
3 0
2 years ago
Read 2 more answers
()<br> 8<br> What is 11 - 2³?
tia_tia [17]

Answer: 3

Step-by-step explanation:

11- 2x2x2 since its 2 to the power of 3 which will give you 8 and than you basically just subtract 11- 8=3

6 0
2 years ago
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-4x + 7 = 2y- 3<br> y-intercept:<br> X-intercept:
Nat2105 [25]
X intercept: (3,0)
y intercept: (0,-3/2)
6 0
3 years ago
Read 2 more answers
I need help!!! Pleasssse!!!!
Zinaida [17]
Given the ratio, you know that:
length = 6x
width = 2x
height = 7x

Because the sum of the length and the width is 24 cm, you can write the equation:
6x + 2x = 24
Solve:
8x = 24
x = 3

Plug the 3 back into the expressions written earlier for length, width, and height.
length = 18 cm
width = 6 cm
height = 21 cm

Use the formula SA = 2B + Ph to solve for the surface area.
Surface Area = 2(area of the base) + (perimeter of the base)(height)

I'm going to plug in l, w, and h as variables for length, width, and height to show the exact way to solve for the B and P.
SA = 2lw + 2(l + w)h
SA = 2(18)(6) + 2(18 + 6)(21)
SA = 216 + 2(24)(21)
SA = 216 + 1008
SA = 1224

The surface area is 1,224 cm^2.


7 0
3 years ago
What the equation of the line that passes through the points (-4, 3) and is parallel to y = ½ x - 7?
Helen [10]

Answer:

y=1/2x + 10

Step-by-step explanation:

since the lines are parallel to each other they have the same gradient which is 1/2.

using the equation y-y1= m(x-x1) we can find the equation of the line

7 0
2 years ago
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