Two ways you can evaluate 15(90-3)

Answers

Answer 1
Answer: 15 of 90 minis 3 15 times 90 minus 3
Answer 2
Answer: 15(90-3)
first way
15 times 90 = 135
15 times 3 = 45
135 - 45 = 90
second way
90-3 = 87
15(87) = 1305
.................................
First way is more likely to be correct....

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On discovering that her family had a 70% risk of heart attack, Erin took a treadmill test to check her own potential of having a heart attack. The doctors told her that the reliability of the stress test is 67%. What is the probability that Erin will not have a heart attack and the test predicts that she will?

Answers

Answer:

A. 0.099

:)

Step-by-step explanation:

Answer-

The probability that Erin will not have a heart attack and the test predicts that she will is, 46.5% .

Hint- This a conditional probability problem where Bayes theorem should be applied.

Solution-

Applying Bayes theorem,

P(No\ heart\ attack\ |\ Correctly\ tested)

=(P(Correctly\ tested\ |\ No\ heart\ attack)P(No\ heart\ attack))/(P(Correctly\ tested))

P(Correctly\ tested\ |\ No\ heart\ attack)=67\%=0.67

P(No\ heart\ attack)=1-P(heart\ attack)=1-0.7=0.3

P(Correctly\ tested)=[P(No\ heart\ attack)* P(Correctly\ tested)]+[P(Heart\ attack)* (Incorrectly\ tested)]

=[0.3* 0.67]+[0.7* 0.33]=0.432

Putting the values,

P(No\ heart\ attack\ |\ Correctly\ tested)=(0.67* 0.3)/(0.432) =0.465

∴ There is a 46.5% chance that Erin will not have a heart attack even though the test predicts that she will.

Select all of the sentences that are punctuated correctly.The dogs's bowl was empty.
The dog's bowl was empty.
The singers's songs were finished.
The singers' songs were finished.

Answers

Answer:

The dogs's bowl was empty. This is wrong as there dogs's is not the way to write.

The dog's bowl was empty. This is the correct form where dog's is written properly.

The singers's songs were finished. This is wrong as singers's is not the way to write.

The singers' songs were finished. This is also correct as singer's is written properly.


The dog's bowl was empty.

The singer's songs were finished.

Two times x divide five

Answers

Answer:

2x/5

Step-by-step explanation:

I need math help ....

Answers

number one is B I believe

Frankie has $40 in his wallet. He decided to buy a pair of earrings for his mom for her birthday. He spent 25% of his money on the earrings. How much were the earrings?

Answers

40x.25=10
He spent 10 dollars on them

The leather of marshalls rectangular poster is 2 times its width. if the perimeter is 24 inches, what is the area of the poster

Answers

Well, the perimeter is the rim of the rectangle and you can use the rim to find the area... but, First you have to find the length and the width
if the width is two times the height when you flip that you get that the height is half of the width
So first you find that half of 24 is 12... this is our width
Now, what is half of 12... 6, this is our height
simple math tells us that to find the area you multiply that height and the width
6 * 12 = 72
so the area of the poster is 72 inches