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maksim [4K]
3 years ago
14

Which of the following are solutions?

Mathematics
1 answer:
rosijanka [135]3 years ago
4 0
4x²-12x+9=5
4x²-12x+4=0

x= 12±√(144-4*4*4) / 2*4

x= 12 ± √(144-64) / 8

x=12±√80. /. 8

x= 12+4√5. /8

x=3±√5 / 2. C and E
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On a certain IQ test, eleven people averaged a 101.5. A certain reality TV star took
dem82 [27]

Answer:

59.98

Step-by-step explanation:

To find the average of a set of numbers, we sum them all together and divide them by the size of the set. Here, we start out with 11 IQ scores. We don't know what they are, but we can still set up an equation with the information we do have. Let's call the sum of those 11 score <em>s</em>. The average must be s/11, which we know is 101.5. With that, we can set up and solve and equation for <em>s</em>:

\dfrac{s}{11}=101.5\\s=101.5(11)\\s=1116.5

Let's call the score of the reality TV star <em>r</em>. If we add their score to the set, we now have <em>12</em> scores. The sum of those scores is gonna be the sum of the previous scores, 1116.5, plus the reality TV star's score, r. To find the average, we divide the sum by 12. Finally, we're told that this average is exactly 98.04. Putting all of this into an equation gives us

\dfrac{1116.5+r}{12}=98.04

We can now solve for r algebraically, first by multiplying both sides by 12:

1116.5+r=98.04(12)\\1116.5+r=1176.48

And then subtracting 1116.5 from both sides:

r=1176.48-1116.5\\r=59.98

6 0
2 years ago
PLS HELP<br><br> Find the value of x and y.
riadik2000 [5.3K]

Answer:

x= 27.71281 = 16√3

y= 13.85641 = 8√3

Step-by-step explanation:

hope it helps :)

3 0
2 years ago
Read 2 more answers
Kent has two similar cylindrical pipes, Pipe A and Pipe B. The radius of Pipe A is 6 cm, and the radius of Pipe B is 2 cm. What
ss7ja [257]
I beilieve its 3:1. I am not completely sure though

6 0
2 years ago
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The probability of a spinner stopping on 3 is 1/8 The probability of the spinner stopping on 6 is 1/8 What is the probability of
Mumz [18]
Your answer is B 1/8 . 
4 0
2 years ago
HELP PLEASE IM BEING TIMED!! WILL GIVE BRAINLIEST!!
kolbaska11 [484]

ANSWER

The correct choice is C.

EXPLANATION

The perimeter of a rectangle is given by;

P=2(w+l)

For the first rectangle, the perimeter is;

P=2(8+4)=24

For the second rectangle, the perimeter is

P=2(8+8)=32

For the third rectangle, the perimeter is

P=2(8+12)=40

The correct choice is C

8 0
3 years ago
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