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PIT_PIT [208]
3 years ago
9

2/3x^2+15=23 help please

Mathematics
1 answer:
Fed [463]3 years ago
5 0

Answer:

x= 4.2

Step-by-step explanation:

2/3x^2=23-15

2/3x^2=8

Sq. root both sides

2/3x = 2.8

multiply both sides by 3

2x= 8.4

divide both sides by 2

x= 4.2

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5 watermelons 6 cantaloupes cost $54. 4 watermelons and 8 cantaloupes $56. how much is a cantaloupe
GREYUIT [131]

Answer:

A cantaloupe costs $4

Step-by-step explanation:

Watermelons = W

Cantaloupes = C

Write given statements as equations

5W + 6C = 54

4W + 8C = 56

Simplify the second equation

4W + 8C = 56

Subtract 8C from both sides of the equation

4W = 56 - 8C

Divide both sides of the equation by 4

W = 14 - 2C

Substitute into second equation

5W + 6C = 54

5(14 - 2C) + 6C = 54

Multiply 5(14 - 2C)

70 - 10C + 6C = 54

Add -10C + 6C

70 - 4C = 54

Add 4C to both sides of the equation

70 = 54 + 4C

Subtract 54 from both sides of the equation

16 = 4C

Divide both sides of the equation by 4

C = 4

A cantaloupe costs $4

5W + 6(4) = 54

Multiply 6(4)

5W + 24 = 54

Subtract 24 from both sides of the equation

5W = 30

Divide both sides of the equation by 5

W = 6

A cantaloupe costs $4

A watermelon costs $6

Hope this helps :)

8 0
3 years ago
$72 with a 40% markup
alex41 [277]

Answer:

$100.80

Step-by-step explanation:

40%/100%×72=$28.80

$72+$28.80=$100.80

8 0
2 years ago
The system has infinitely many solutions. Rearranging the left side of the 2nd equation and subtracting 3a from both sides gives
Alex_Xolod [135]

Answer:

https://web.williams.edu/Mathematics/sjmiller/public_html/105/hwsolns/HWSolns_Math105_Sp2013.pdf  click the link

Step-by-step explanation:

5 0
3 years ago
Solve by using subitution
Bas_tet [7]

Y=2x+1
2x-y=2
2x-(2x+1)=2
-1=2
-1+1=2+1
0=3


No solution
4 0
2 years ago
Read 2 more answers
What is the length of a rectangle with width 18 inand area 153 in.??
lorasvet [3.4K]

Answer:

8.5 in

Step-by-step explanation:

Area = Length × Width

153 = L × 18

L = 153÷18

L= 8.5

L= 8.5 in

7 0
2 years ago
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