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3 years ago

NEED HELP PLZ DUE IN 20 AND CAN YOU SHOW WORK PLZ

Mathematics

1 answer:

slava [35]3 years ago

3 0

Answer:

59.) 80 smokers, 280 nonsmokers.

61.) 240 men, 200 women

Step-by-step explanation:

59.)

Start with:

$\frac{2}{7}= \frac{x-100}{x+100}$

Cross product.

$2x+200=7x-700$

Subtract $2x$ from both sides of the equation.

$200=5x-700$

Add $700$ to both sides of the equation.

$900=5x$

Divide by $5$

$x=180$

Substitute in your x-value.

$(180)-100 = 80$

$(180)+100= 280$

61.)

Start with:

$6x+5x=440$

Combine like terms.

$11x=440$

Divide by the coefficient of $x$ , which is $11$

$x=40$

Substitute.

$6(40)=240$

$5(40)=200$

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babunello [35]

To find the slope, you use the slope formula (m):

$m=\frac{y_2-y_1}{x_2-x_1}$ and plug in the two points

(-3, 4) = (x₁, y₁)

(2, -1) = (x₂, y₂)

$m=\frac{y_2-y_1}{x_2-x_1}$

$m=\frac{-1-4}{2-(-3)}$ [two negatives cancel each other out and become positive]

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

$m=\frac{-5}{5}$

m = -1 The slope is -1

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4 years ago

Read 2 more answers

Lian is deciding which of two gyms to join. Each gym charges a monthly rate plus a one-time membership fee.Lian correctly wrote

Vanyuwa [196]

Both gyms charge the same monthly rate and the same membership fee

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4 years ago

Read 2 more answers

20 POINTS AND WILL MARK BRAINLIEST PLZ HELP

k0ka [10]

Answer:

The answer is A

Step-by-step explanation:

y = mx + c

m = 1/2

(2,-3)

y = (1/2)x + c

-3 = (1/2)(2) + c

c = -4

y = (1/2)x - 4

7 0

3 years ago

2. P337. 23. A large box contains 10,000 ball bearings. A random sample of 120 is chosen. The sample mean diameter is 10 mm, and

Rashid [163]

Answer:

B is True

A, C. D are false

Step-by-step explanation:

Given :

Sample size, n = 120

Mean diameter, m = 10

Standard deviation, s = 0.24

Confidence level, Zcritical ; Z0.05/2 = Z0.025 = 1.96

The confidence interval represents how the true mean value compares to a set of values around the mean computed from a set of sample drawn from the population.

The population here is N = 10000

To obtain

Confidence interval (C. I) :

Mean ± margin of error

Margin of Error = Zcritical * s/sqrt(n)

Margin of Error = 1.96 * 0.24/sqrt(120)

Confidence interval for the 10,000 ball bearing :

10 ± 1.96 * (0.24) / sqrt(120)

Hence. The confidence interval defined as :

10 ± 1.96 * (0.24) / sqrt(120) is the 95% confidence interval for the mean diameter of the 10,000 bearings in the box.

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3 years ago

A number divided by 3 less then itself gives a quotient of 8/5. Find the number

Airida [17]

We Can Let "A Number" Be M.
M Divided By 3 Less Than Itself Gives Quotient Of 8/5.
M/(M-3) = 8/5. Lets Solve.

$\frac{M}{(M - 3)} = \frac{8}{5}$
So, What Number Can Have 3 Subtracted From It To Get Five, But Also Be Equal To Eight?
Eight Of Course!!!
So, We Know That The Number Equals 8.

8 0

3 years ago