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PtichkaEL [24]
4 years ago
7

A math class has

Mathematics
1 answer:
myrzilka [38]4 years ago
7 0
The probability of selecting a boy from the seventh grade is 3/6.
The probability of selecting a boy from the eighth grade is 3/8.
The probability the the selected students are both boys is:
\frac{3}{6}\times\frac{3}{8}=\frac{3}{16}
The answer is: 3/16 or as a decimal fraction 0.1875.
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A new novel is selling for $21.95. If it is on sale at 20% off, find the amount of the discount and the sale price.
Finger [1]
21.95×.2=4.39
21.95-4.39=17.56

the discount is $4.39
and the total sale price is $17.56
7 0
4 years ago
A packet of vegetable seeds has a germination rate of
Doss [256]

N = number of seeds planted

P = probability of germination

K = number that germinated

Using probability calculation:
p(x = k) = (n k) x 0.90^K x 0.10^n-k


p(10) = (12 10) x 0.90^10 x 0.10^2

P(10) = 0.2310

8 0
2 years ago
Please help #2! I’ll give first and correct brainliest!
inna [77]

Answer:

Confused as well

Step-by-step explanation:

If there are hypothetically 10 hours a day with 100 minutes an hour and 100 seconds per minute

at 6 pm there would be 18 hours gone in the day

18 normal hours are equal to 18*60*60 = 64800 seconds

(64800 seconds) / 10000 ( for hours)

6:48 would be the replacement  time

but this answer is wrong bc it's not an option

6 0
3 years ago
30% of Number A is the same as 40% of Number B.
Goryan [66]

30% of number A means

\dfrac{30A}{100}=\dfrac{3A}{10}

similarly, 40% of number B means

\dfrac{40B}{100}=\dfrac{2B}{5}

These must be equal, so we have

\dfrac{3A}{10}=\dfrac{2B}{5}

Multiply both sides by 10 to get

3A=4B \iff A=\dfrac{4B}{3}

So, you can choose any number for A, and then you multiply it by 4/3 to get B. There are infinitely many solutions to this equation.

5 0
3 years ago
Help please photo is above
Zina [86]

Answer:

y = 5

x = 10

Step-by-step explanation:

-4(2y) + 11y

-8y + 11y = 15

3y = 15

/ 3 /3

y = 5

x = 10

3 0
3 years ago
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