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const2013 [10]
3 years ago
8

I will mark Brainliest for first and correct answer. PLEASE NO LINKS

Mathematics
1 answer:
umka21 [38]3 years ago
4 0

Answer:

c) $18 for a pack of 15 pens

Step-by-step explanation:

calculate the cost for 1 pen then compare

a) 7 ÷ 5 = 1.4

b) 15 ÷ 10 = 1.5

c) 18 ÷ 15 = 1.2 (has the lowest cost for a pen)

d) 48 ÷ 30 = 1.6

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Solve the equation sine Ф=0.6792 for 0°≤Ф≤360
Sergio [31]

Answer:

42.78⁹, 137.22⁹.

Step-by-step explanation:

sine Ф=0.6792

Angle Ф in the first quadrant = 42.78 degrees.

The sine is also positive in the second quadrant so the second solutio is

180 - 42.78

= 137.33 degres.

3 0
3 years ago
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Step-by-step explanation:

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Helllpppppppppp please someone.?????
Liula [17]

Answer:

(-5,5)

Step-by-step explanation:

Multiply the first equation by -2,and multiply the second equation by 1.

−2(x+5y=20)

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−2x−10y=−40

2x−7y=−45

Add these equations to eliminate x:

−17y=−85

Then solve−17y=−85for y:

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y=5

x+5y=20

Substitute  5 for y in x+5y=20:

x+(5)(5)=20

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19) Find the acros F(x) = x4 + 8x? -​
Yuri [45]

Answer:

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Step-by-step explanation:

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3 years ago
Find the surface area of each figure. Round your answers to the nearest tenth, if necessary​
ss7ja [257]

Answer: 109m^2

Step-by-step explanation:

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