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Vanyuwa [196]
2 years ago
13

Solve for the value of R. SOMEONE PLEASE HELP ILL GIVE YOU POINTS AND BRAINLIST ANSWER !!!

Mathematics
1 answer:
lord [1]2 years ago
7 0

Step-by-step explanation:

(3r + 4)  + (8r - 2) = 90

3r + 4 + 8r - 2= 90

11r = 88

r =  \frac{88}{11} \\

r = 8

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PLEASE HELP HELP HELP HELP HELP HELP
RideAnS [48]

|\Omega|=12\cdot11\cdot10=1320\\|A|=9\cdot8\cdot7=504\\\\P(A)=\dfrac{504}{1320}=\dfrac{21}{55}\approx38.2\%

7 0
4 years ago
A square has points at (2, 2) and (5, 2). What is the perimeter of the square?
DENIUS [597]

Answer:

These two points are 3 Units away from each other. 5 - 2 = 3

This accounts for one side of the square, to find the entire perimeter multiply 3 × 4 = 12

The perimeter of the square is 12 units

4 0
3 years ago
Center -c (3,-2), radius 4. ​
taurus [48]

Answer:

(x-3)^2+(y+2)^2=16

Step-by-step explanation:

center (h,k) radius r

(x-h)^2+(y-k)^2=r^2

6 0
3 years ago
In order to estimate the average electric usage per month, a sample of 81 houses was selected and the electric usage was determi
lana [24]

Answer:

Confidence interval:  (1760,1956)

Step-by-step explanation:

We are given the following information in the question:

Sample size, n = 81

Sample mean =

\bar{x} = 1858 \text{ kWh}

Population standard deviation =

\sigma = 450 \text{ kilowatt-hours}

Confidence Level = 95%

Significance level = 5% = 0.05

Confidence interval:

\bar{x} \pm z_{critical}\displaystyle\frac{\sigma}{\sqrt{n}}

Putting the values, we get,

z_{critical}\text{ at}~\alpha_{0.05} = \pm 1.96

1858 \pm 1.96(\displaystyle\frac{450}{\sqrt{81}} ) = 1858 \pm 98 = (1760,1956)

6 0
3 years ago
HELP PLEASE IM ALMOST DONE I WILL MARK BRAINLIEST
gulaghasi [49]

Answer:

y = 94

x = 86

Step-by-step explanation:

brainliest plz

7 0
3 years ago
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