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2 years ago

A teacher gave two tests. 59% passed both tests. 78% passed the first test. What

Mathematics

2 answers:

qwelly [4]2 years ago

6 0

The answer would be A

Elenna [48]2 years ago

5 0

The answer is 76% or A

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Select all ratios equivalent to 22:10. 11:5 110:50 33:15

saveliy_v [14]

Answer:

All the 3 choices are correct.

Step-by-step explanation:

11:5 11 divided by 22 is 1/2 and 5/10 is 1/2

110/50 110 divided by 22 is 5 and 50 divided by 10 is 5

33/15 33 divided by 22 is 1 1/2 and 15 divided by 10 is 1 1/2

5 0

2 years ago

Read 2 more answers

Simplify -7(-4p+1) + 2p

mariarad [96]

Step-by-step explanation:

-7(-4p+1) + 2p

-7 x -4 = 28p

-7 x 1 = -7

28p + 2p = 30p

30p-7

8 0

2 years ago

Help i don’t know how to do this

lyudmila [28]

Answer:

ok so first you add all the prices together.

$9:00+$7:00+$8:00+$6:00+$4:00=34

then divide 34 by the number of prices.

34/5

then you get the mean

$6.8 is the mean

Step-by-step explanation:

7 0

2 years ago

PLEASEEE HELPPPP ASAPPPP

stellarik [79]

$\cos 27^{\circ} = \dfrac{KL}x\\\\\implies \cos 27^{\circ} = \dfrac{6.3}x\\\\\implies x = \dfrac{6.3}{\cos 27^{\circ}}=7.1~ \text{units.}$

6 0

2 years ago

Jason inherited a piece of land from his great-uncle. Owners in the area claim that there is a 45% chance that the land has oil.

oksian1 [2.3K]

Answer:

0.36 = 36% probability that the land has oil and the test predicts it

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.

45% chance that the land has oil.

This means that $P(A) = 0.45$

He buys a kit that claims to have an 80% accuracy rate of indicating oil in the soil.

This means that $P(B|A) = 0.8$

What is the probability that the land has oil and the test predicts it?

This is $P(A \cap B)$ . So

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

$P(B \cap A) = P(B|A)*P(A) = 0.8*0.45 = 0.36$

0.36 = 36% probability that the land has oil and the test predicts it

5 0

2 years ago