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katrin [286]
3 years ago
15

Eva is a kickboxing instructor who will be teaching classes at a local gym. To get certified as an instructor, she spent a total

of $57. Eva will be earning a base salary of $51 per month from the gym, plus an additional $3 for every class she teaches. If Eva teaches a certain number of classes during her first month as an instructor, she will earn back the amount she spent on certification. How much will Eva's expenses and earnings be? How many classes will that take?
Mathematics
1 answer:
zlopas [31]3 years ago
6 0

Answer:57+51+3

Step-by-step explanation: use https://www.cymath.com/

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Please help I have no idea how to do this!
Alexus [3.1K]

Answer:

D. <B = 141°

Step-by-step explanation:

The <u>sum of interior angles</u> of a polygon is

(n-2)*180, where n is the number of sides!

Sum of angles for our polygon that has 7 sides must be:

(7-2) *180 = 5*180 = 900

Sum of angles that are in the picture are:

120+129+130+142+90+148+ <B = 759 + <B

<B = 900 -759 = 141°

Check our work:

120°+129°+130°+142°+90°+148°+ 141° = 900°✅

7 0
2 years ago
solve the average time for a student to complete this quiz is 24 24 minutes with a standard deviation of 2 minutes. What is the
LuckyWell [14K]

Answer:

The correct answer is "(18, 30) minutes".

Step-by-step explanation:

Mean,

= 24

Standard deviation,

= 2

The range of minutes where 99.7% of individuals completed the quiz will be:

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On substituting the values, we get

= 24 \pm 3\times 2

= 24 \pm 6

now,

= 24-6

= 18

Or,

= 24+6

= 30

i.e., 18 to 30 minutes

3 0
3 years ago
Solve for the roots in simplest form using the quadratic formula:<br> 4x^2+5=−12x
MA_775_DIABLO [31]
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1-9.
abruzzese [7]
Uhh I think it's B or c
8 0
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———— = ———- = —- = —
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