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3 years ago

Help please with work

Mathematics

1 answer:

Dmitrij [34]3 years ago

4 0

Answer:

200.96 ft²

Step-by-step explanation:

The question is on surface area of a closed cylinder

Formulae= SA=2 ×pi× r² + 2×pi×r×h

Where pi=3.14

SA= 2×3.14×2² + 2×3.14×2×14

SA=25.12+175.84

SA=200.96 ft²

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The test to detect the presence of respiratory syncytial virus is 97% accurate for a person who has the virus and 99% accurate f

user100 [1]

$\textrm{97 percent accurate for individual with the virus}$

$\text{3 percent inaccurate}$

$\textrm{99 percent accurate for an individual}$

$\textrm{1 percent inaccurate probability}$

$\textrm{Probability of infected:}$

$.0055$

$\textrm{Probability of not being infected}$

$1 - .0055 = .9945$

$\textrm{Combine it all together}$

$0.0055 * 0.03 + 0.9945 * 0.01 = 0.01011$

$\textrm{The probability that a randomly chosen person gets an incorrect result is 0.01011}$

$\textbf{Answer}$

$\textrm{0.01011}$

5 0

3 years ago

I need help with a question

natka813 [3]

We have the function:

$y=-\frac{2}{3}x+7$

When we have the value of x, and we want to find the value of y, we replace x in the equation and calculate.

For x=-6, we have:

$y=-\frac{2}{3}\cdot(-6)+7=\frac{-2\cdot6}{3}+7=-\frac{12}{3}+7=-4+7=3$

The value of y for x=-6 is y=3.

When we know y, and we want to know the value of x, we replace y and calculate.

For y=5, we have:

$\begin{gathered} 5=-\frac{2}{3}x+7 \\ 5-7=-\frac{2}{3}x \\ -2=-\frac{2}{3}x \\ x=-2\cdot(-\frac{3}{2})=\frac{2\cdot3}{2}=3 \end{gathered}$

For y=5, the value of x is x=3.

We repeat this for the last two cases:

x=15, the value of y is y=17

$y=-\frac{2}{3}(15)+7=10+7=17$

y=15, the value of x is x=-12

$\begin{gathered} 15=-\frac{2}{3}x+7 \\ 15-7=-\frac{2}{3}x \\ 8=-\frac{2}{3}x \\ 8\cdot3=-2x \\ 24=-2x \\ x=\frac{24}{-2}=-12 \end{gathered}$

8 0

1 year ago

In triangle PQR, the measure of angle P is

nlexa [21]

Answer:

3p+p+p+30=180

Step-by-step explanation:

P=30 degrees

Q=3p=90 degrees

R= p+30=60 degrees

(i hope this is right)

8 0

3 years ago

Can someone solve this, you don’t have to type an explanation, thank you.

lapo4ka [179]

Answer:

107

Step-by-step explanation:

the angle left of the 57 is 180-57 = 123

Sum of angles in quadilateral is 360, so

x = 360 - 60 - 70 - 123 = 107

8 0

3 years ago

The ratio of the number of women to the number of men to the number of children in a room is 5:2:7, respectively. What is the to

Vinvika [58]

Answer:

The total number of people in the room is 14

Step-by-step explanation:

The ratio of the number of women to the number of men to the number of children in a room is 5:2:7

So, there are

5 women
2 men
7 children

(1) The total number of women and children in the room is 12.

5 women and 7 children=12

(2) There are fewer than 4 men in the room.

There are 2 men , that´s fewer than 4

So, the total number of people is 5+2+7= 14

7 0

3 years ago