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Stolb23 [73]
3 years ago
9

Please Help I will reward brainliest

Mathematics
1 answer:
GarryVolchara [31]3 years ago
7 0
7.75 is the answerto the equation

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1. The sum of first n terms of an arithmetic sequence is 3n²+4n
valentina_108 [34]

Answer:

<h3>           a.  a₁=7,     b.  a_n=7n+1,    c.  a₂₀=141</h3>

Step-by-step explanation:

a.

 a_1=S_1=3\cdot1^2+4\cdot1=3+4=7

b.

   a_1+a_2=S_2\\\\a_1+a_1+d=3\cdot2^2+4\cdot2\\\\7+7+d=3\cdot4+8\\\\14+d=12+8\\\\d=6\\\\\\a_n=a_1+d(n-1)\\\\a_n=7+6(n-1)\\\\a_n=7+6n-6\\\\\underline{a_n=7n+1}

c.

 a_{20}=7\cdot20+1=141

5 0
3 years ago
It takes Maya 30 minutes to solve 5 logic puzzles, and it takes amy 28 minutes to solve 4 logic puzzles. use models, to show the
nalin [4]

Answer:

maya - 6 min per puzzle

amy - 7 min per puzzle

maya would finish first since her unit rate is smaller. for example, it takes maya 30 for 5 but it would take 35 for 5.

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
87-(36.5-11.5)*(-3)+9 simplify using order of operations
OLga [1]
Remember PEMDAS 
Do parentheses, results in 25. So whats left is 87-25*(-3)+9
Then you multiply -25 by -3, answer is 75.        87+75+9
Add all of them up.                                                171
The answer is 171!
5 0
3 years ago
Read 2 more answers
-5=-2/9x<br>I dont know the answer​
love history [14]
-5=-2/9x.

x=22.5 / x=45/2
4 0
3 years ago
Read 2 more answers
Which of the following describes the image of a figure after a dilation that has a scale factor between zero and one?
g100num [7]

Answer:

When a figure or shape is dilated , the size of the figure either enlarges or shrank without changing its actual shape.

Shape or figure after dilation is similar to original figure.

If the scale or factor of dilation is greater than 1 the shape enlarges.

If the scale factor lies between 0<scale factor<1, then the figure shrinks i.e size reduces.

So out of all the options given →It has the same shape as the original and is smaller than the original figure.




7 0
3 years ago
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