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never [62]
3 years ago
12

Reuben has scores of 70,75,83, and 80 on four spanish quizzes. what score must he get on the next quiz to achieve an average of

at least 80?
Mathematics
2 answers:
Ludmilka [50]3 years ago
6 0
Ok well If he gets a 92 percent he will have a 80!! :)

Sergio [31]3 years ago
4 0
X - the score he must get

\frac{70+75+83+80+x}{5} \geq 80 \\
\frac{308+x}{5} \geq 80 \\
308+x \geq 400 \\
x \geq 92

He must get at least 92 points.
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Find the sum of a finite geometric sequence from n = 1 to n = 6, using the expression −2(5)n − 1.
vazorg [7]
\bf \qquad \qquad \textit{sum of a finite geometric sequence}\\\\
S_n=\sum\limits_{i=1}^{n}\ a_1\cdot r^{i-1}\implies S_n=a_1\left( \cfrac{1-r^n}{1-r} \right)\quad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
r=\textit{common ratio}\\
----------\\
a_1=-2\\
r=5\\
n=6
\end{cases}
\\\\\\
S_6=-2\left( \cfrac{1-5^6}{1-5} \right)
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3 years ago
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Dmitrij [34]

YES IT IS RIGHT.YOU ARE RIGHT

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3 years ago
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What is the value of ?<br> –34<br> –2<br> 10<br> 34
Zolol [24]

Answer:

-2

Step-by-step explanation:

Remember to follow PEMDAS. First solve parenthesis, power, multiplication, then add.

(5 - 2) = 3

(-4)² = (-4)(-4) = 16

3(-6) = -18

16 + (-18) = 16 - 18 = -2

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7 0
3 years ago
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What is ​ BC ​ ? <br><br> Enter your answer in the box.<br><br> units
Vladimir79 [104]

Answer:

BC = 25

Step-by-step explanation:

AB = AC since it is an isosceles triangle

4x+1 = 2x+23

subtract 2x from each side

4x-2x+1 = 2x-2x+23

2x +1 = 23

subtract 1 from each side

2x+1 -1 = 23-1

2x = 22

divide by 2

2x/2 =22/2

x =11

BC = 3x-8

BC = 3(11) -8

BC =33-8

BC = 25


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3 years ago
You borrow $375 and pay back $20 each week what are the first 6 terms in the sequence
solmaris [256]
0,20,40,60,80,100,120
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