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2 years ago

100 pts+brainliest

Mathematics

2 answers:

otez555 [7]2 years ago

7 0

Thinking it as a propotional increase, find the unit rate of change.

values: (0, 536,000), (-5, 441,000), (-1, 517,000)

unit rate of change:

$\sf \dfrac{y2-y1}{x2-x1}$

$\dashrightarrow \sf \dfrac{536,000-441,000}{0-(-5)}$

$\dashrightarrow \sf 19000$

Therefore, the sales increase by $19000 each year.

After 8 years the sale increasement:

$19000 * 8

$152000

Total sales amount:

current sales + increasement in sales

$536,000 + $152000

$688,000

So, correct answer is : $688,000

Damm [24]2 years ago

3 0

Answer = 688 thousand / 688,000

Explanation - 536-517 = 19 so 19000 x 8 + 536000 = 688,000

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The length of a rectangular garden is 10 feet longer than its width. The garden's perimeter is 212 feet. Find the length of the

alekssr [168]

Answer:

a = 2091 ft²

Step-by-step explanation:

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3 years ago

I inserted a pick of my problem pls help,its for aleks

Fantom [35]

Answer:

Graph the point (1, -4), then proceed to use the slope either way. for example another point would be (-2, -5)

5 0

3 years ago

Assume that when adults with smartphones are randomly selected, 48% use them in meetings or classes. If 8 adult smartphone use

Lisa [10]

Answer:

The probability is 2.2%

Step-by-step explanation:

The probability that a randomly selected adult uses the telephone in classes is always equal to 0.48.

If x represents the number of adults selected from among the 8 that the telephone uses in classes, then x is a discrete random variable that follows a binomial distribution, with:

p = 0.48

q = 0.52

n = 8

We want to find the probability of x = 5

$P(x) = \frac{n!}{x!(n-x)!} *p ^ n *q ^{n-x}\\\\ P(x = 5) = \frac{8!}{5!(8-5)!} * 0.48 ^ 8 * 0.52 ^ 3\\\\ P(x = 5) = 0.02218$

The probability is 2.2%

6 0

3 years ago

When doing blood testing for a viral infection, the procedure can be made more efficient and less expensive by combining partial

Serjik [45]

Answer:

0.1694 = 16.94% probability of a positive result for three samples combined into one mixture.

Step-by-step explanation:

For each test, there are only two possible outcomes. Either it is positive, or it is negative. The probability of a test being positive or negative is independent of any other test, which means that the binomial probability distribution is used to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

In which $C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And p is the probability of X happening.

The probability of an individual blood sample testing positive for the virus is 0.06.

This means that $p = 0.06$

If samples from three people are combined and the mixture tests negative, we know that all three individual samples are negative. Find the probability of a positive result for three samples combined into one mixture.

It will be positive if at least one of the tests is positive, that is:

$P(X \geq 1) = 1 - P(X = 0)$

In which

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$P(X = 0) = C_{3,0}.(0.06)^{0}.(0.94)^{3} = 0.8306$

Then

$P(X \geq 1) = 1 - P(X = 0) = 1 - 0.8306 = 0.1694$

0.1694 = 16.94% probability of a positive result for three samples combined into one mixture.

8 0

3 years ago

Maya has 3 times as many dimes as nickels. She has 4 more quarters than nickels. if she has a total of $9.40, how many of each t

puteri [66]

Answer: nickels = 14, dimes = 42, quarters = 18

Step-by-step explanation:

Let n represent nickels which has a value of $0.05

Let d represent dimes which has a value of $0.10

Let q represent quarters which has a value of $0.25

It is given that:

n = n

d = 3n

q = n + 4

and their total value is $9.40 ⇒ n + d + q = $9.40

Use substitution to find the quantity of nickels:

.05(n) + .10(3n) + .25(n + 4) = 9.40

5n + 10(3n) + 25(n+4) = 940 multiplied by 100

5n + 30n + 25n + 100 = 940 distributed

60n + 100 = 940 added like terms

60n = 840 subtracted 100

n = 14 divided by 60

n = 14

d = 3n

= 3(14)

= 42

q = n + 4

= (14) + 4

= 18

4 0

3 years ago