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4 years ago

Please help I don't understand

Mathematics

1 answer:

valina [46]4 years ago

6 0

17) The line that is John is closer to certain but not exactly on certain so I'd say it's "likely"

18) Using that same example as the one above, if 0 means impossible, then 1 means certain. I'd place your label for Sara at 1.

19) Let s = sides of the square. There are 4 sides and all sides are equal so we can set up the equation 4s = 64. Divide both sides by 4. s = 16. Now add 2 to this. 16 + 2 = 18. The length of each side of the original square was 18.

20) If the scale is 1 cm : 1 meter and the height of the model is 16 cm, then the actual plane must be 16 meters.

21) 2x and 100 are supplementary angles meaning together they must add up to 180.

2x + 100 = 180
2x = 180 - 100
2x = 80
Divide both sides by 2
x = 40

22) Assuming 3x is supposed to be the right angle, right angles are 90 degrees.

3x = 90
Divide by 3 on both sides
x = 30.

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At the hardware store 2/4 of the nails are size 2d and 1/4 of the nails are size 4D what fraction of the nails are either size 2

sashaice [31]

Answer:

$\frac{3}{4}$ of the nails are either size 2d or 4d

Step-by-step explanation:

we know that

$\frac{2}{4}$ of the nails are size 2d

$\frac{1}{4}$ of the nails are size 4D

To find the fraction of the nails that are either size 2d or 4d, sum $\frac{2}{4}$ plus $\frac{1}{4}$

$\frac{2}{4} +\frac{1}{4}=\frac{3}{4}$

7 0

4 years ago

14. Suppose that 1 out of every 10,000 doctors in a certain region is infected with the SARS virus; in the same region, 20 out o

hram777 [196]

Answer:

The person in the at-risk population is much more likely to actually have the disease

Step-by-step explanation:

The probability of a randomly selected doctor having the disease is 1 in 1,000 (P(I)=0.0001).

The probability that a doctor is infected with SARS, given that they tested positive is:

$P(I|+)=\frac{P(I)*0.99}{P(I)*0.99+(1-P(I))*0.01}\\P(I|+)=\frac{0.0001*0.99}{0.0001*0.99+(1-0.0001)*0.01}\\P(I|+)=9.9*10^{-3}$

The probability of a randomly selected person from the at-risk population having the disease is 20 in 100 (P(I)=0.20).

The probability that a person in the at-risk population is infected with SARS, given that they tested positive is:

$P(I|+)=\frac{P(I)*0.99}{P(I)*0.99+(1-P(I))*0.01}\\P(I|+)=\frac{0.2*0.99}{0.2*0.99+(1-0.2)*0.01}\\P(I|+)=0.962$

Therefore, the person in the at-risk population is much more likely to actually have the disease

3 0

3 years ago

1/8 to the -3rd power

rodikova [14]

(1/8)^-3

First apply the exponent to the numerator and denominator
(1^-3/8^-3)

Then flip the fraction to get rid of negative exponents
8^3/1^3

Then evaluate exponents
512/1

Divide the numerator by the denominator
512

Final answer: 512

5 0

3 years ago

Find the equation of the line that Contains the point (4,-2) and is perpendicular to the line y = -2x+5

MaRussiya [10]

Y=1/2x-4

Perpendicular means it is opposite and the reciprocal. 1/2(4) = 2-4 equals -2.
(4,-2)

4 0

3 years ago

PLEASE HELP ASAP!!! I NEED CORRECT ANSWERS ONLY PLEASE!!! I NEED TO FINISH THESE QUESTIONS BEFORE MIDNIGHT TONIGHT.

Naily [24]

Answer:

Step-by-step explanation:

Triangle HIJ is a right angle triangle.

From the given right angle triangle

IJ represents the hypotenuse of the right angle triangle.

With ∠J as the reference angle,

HJ represents the adjacent side of the right angle triangle.

HI represents the opposite side of the right angle triangle.

To determine IJ, we would apply Sine trigonometric ratio. It is expressed as

Sin θ = opposite side/hypotenuse. Therefore,

Sin 54 = 7/IJ

0.8090 = 7/IJ

IJ = 7/0.8090

IJ = 8.7 to the nearest tenth

4 0

3 years ago