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3 years ago

PLEASE HELP ME WITH THESE. I have tried everything...

Mathematics

1 answer:

s2008m [1.1K]3 years ago

5 0

What you need to do is combine like terms.

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You spend $40 on a meal including tax and want to leave a tip that is 20% of the $40. What is the total cost, with the tip?

fenix001 [56]

Your total would be $48.00

7 0

3 years ago

Read 2 more answers

A ship goes at the rate of (3m-2) knots per hour. How far can it travel in (4m+9) hours?

Ber [7]

Answer: $12m^2+19m-18$

Step-by-step explanation:

Given

Speed of boat $v=3m-2\ \text{knots per hour}$

$\text{time t= }4m+9\ \text{hours}$

$\Rightarrow \text{Distance =speed}\times \text{time}$

$\Rightarrow \text{Distance d=}(3m-2)\cdot (4m+9)\\\Rightarrow d=12m^2+19m-18$

7 0

3 years ago

A diagnostic test for a disease is such that it (correctly) detects the disease in 90% of the individuals who actually have the

Ne4ueva [31]

Answer:

0.2177 = 21.77% conditional probability that she does, in fact, have the disease

Step-by-step explanation:

Conditional Probability

We use the conditional probability formula to solve this question. It is

$P(B|A) = \frac{P(A \cap B)}{P(A)}$

In which

P(B|A) is the probability of event B happening, given that A happened.

$P(A \cap B)$ is the probability of both A and B happening.

P(A) is the probability of A happening.

In this question:

Event A: Test positive

Event B: Has the disease

Probability of a positive test:

90% of 3%(has the disease).

1 - 0.9 = 0.1 = 10% of 97%(does not have the disease). So

$P(A) = 0.90*0.03 + 0.1*0.97 = 0.124$

Intersection of A and B:

Positive test and has the disease, so 90% of 3%

$P(A \cap B) = 0.9*0.03 = 0.027$

What is the conditional probability that she does, in fact, have the disease

$P(B|A) = \frac{P(A \cap B)}{P(A)} = \frac{0.027}{0.124} = 0.2177$

0.2177 = 21.77% conditional probability that she does, in fact, have the disease

3 0

3 years ago

Ma poate ajuta cineva pls!

guapka [62]

Me no understand spanish buddy

3 0

3 years ago

Please help me please

Masja [62]

Ok so for number 2. There are 101,934 people living in the city and there are 29,382 people in the suburbs. They want the total amount of people living in the whole city. The problem would be 101,934+29,382= and it would equal B. <span>131316. I hope that this helped you.</span><span />

7 0

3 years ago