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2 years ago

Plz I need some help with 11-12 . My teacher didn’t even explain it correctly so now I’m confused.

Mathematics

1 answer:

rusak2 [61]2 years ago

6 0

Answer:

Step 1: Transpose everything to one side

12. x²+16x+15-10x+4=0

Step 2: Add the like terms

x² + (16x - 10x) + 15 + 4=0

x² + 6x + 19=0

Step 3: Use the quadratic formula to get the value(s) of x.

a=1 b=6 c=19

$x = \frac{ - b + - \sqrt{b {}^{2} - 4ac } {}^{} }{2a}$

therefore, x=... or x

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70% of kids who visit a doctor have a fever, and 40% of kids who visit a doctor have a sore throat. If the probability that a ki

krek1111 [17]

Answer:

52.5%

Step-by-step explanation:

Let A be kids who have a fever, and B be kids who have a sore throat, so

Based on the given information we have

P(A) = 70%, P(B) = 40%, and P(B|A) = 30% (B|A is read as "B given A", which means probability of B happening given that A has already happened)

We are asked to find P(A|B), the probability of a kid having a fever given that we already know he has a sore throat.

Step 1: First find P(A and B), this is the probability of a kid having both a fever and a sore throat. We use the formula

P(B|A) = P(A and B)/P(A)

We have 2 of these values listed above, so we plug them in...

30% = P(A and B)/70%

This give us a value for P(A and B) which equals 21% [multiply both sides by 70% to isolate P(A and B), (30%)(70%) = 21%]

Now we flip the equation to P(A|B), which is

P(A|B) = P(A and B)/P(B)

We have 2 of the values, so we plug them in...

P(A|B) = 21%/40%

This gives us a value of 52.5% (divide 21% by 40%)

6 0

3 years ago

NOV 06, 2:1

Lelu [443]

Answer: 5

Step-by-step explanation:

8 0

2 years ago

Read 2 more answers

Segment CD has endpoints at C(0, 3) and D(0, 7). If the segment is dilated by a factor of 3 about point C, what is the length of

Klio2033 [76]

The distance is dilated by a factor of 3, the length of the image of segment CD will be 4(3) which is 12 units

Given the coordinate of the segment CD with endpoints at C(0, 3) and D(0, 7) is expressed as:

$D=\sqrt{(7-3)^2(0-0)^2}\\D=\sqrt{4^2}\\D = 4 units$

If the distance is dilated by a factor of 3, the length of the image of segment CD will be 4(3) which is 12 units

Learn more here: brainly.com/question/22624745

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2 years ago

What number must be added to the polynomial to complete the square? Use the slash mark ( / ) as a fraction bar if necessary.x2 +

Solnce55 [7]

X does not equal one but there is 1x in the problem so it is 1.
So.. to complete the square you always take 1/2 of that number.

so half of 1 is 1/2.
Then you square that number 1/2 * 1/2 = 1/4 <span>
</span>

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3 years ago

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