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lesya692 [45]
3 years ago
7

Solve: 18/20 - 3/5 = ?

Mathematics
2 answers:
aivan3 [116]3 years ago
8 0

Answer; 1

Step-by-step explanation:

18/20-3/5

15/15

Alinara [238K]3 years ago
5 0

Answer:

6/20 or 3/10

Step-by-step explanation:

You just convert the second fraction's denominator to equal the first's (and modify the numerator accordingly), then subtract the numerators, in this instance, you muliply the 5 by 4 and what you do the bottom, you must do to the top, so you multiply 3 by 4 and get 12. 18 - 12 = 6, giving you 6/20, which converted is 3/10.

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svet-max [94.6K]
Number 4 is correct a^0=1 for all real number a
number 5
y^2(y^2=y^(2+2)=y^4 correct
y^6/y^2=y^(6-2)=y^4 correct
y^0=1 false
y^9/y^5=y^(9-5)=y^4 correct
y^4(y^1)=y^(4+1)=y^5 false
4 0
3 years ago
Read 2 more answers
A sample of 100 footballs showed an average air pressure of 13 psi. The standard deviation of the population is known to be .25
Vladimir79 [104]

Answer:

0.025 is the standard error of mean.

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 100

Sample mean = 13 psi

Population standard deviation = 0.25 psi

We have to find the standard error of the mean.

Formula:

Standard error =

\dfrac{\sigma}{\sqrt{n}} = \dfrac{0.25}{\sqrt{100}} = \dfrac{0.25}{10} = 0.025

0.025 is the standard error of mean.

7 0
3 years ago
How many months of the year have 28 days??
My name is Ann [436]
All 12 months have 28 days in it.
because every month has 28 days ( February) or more number of days like the other months(Jan, Mar..)
4 0
3 years ago
9) A heptagon has 6 exterior angles with measures of 47, 55, 62, 64, 54, and 49. What is the measure of the interior angle adjac
svetlana [45]

Answer:

seventh  interior angle=∠x=29°

Step-by-step explanation:

sum of interior angle of polygon is equal to 360°

let seventh angle of heptagon is x

∠x+47°+55°+62°+64°+54°+49°=360°

∠x=360°-(47°+55°+62°+64°+54°+49°)

∠x=360°-331°=29°

∠x=29°

seventh  interior angle=∠x=29° answer

6 0
3 years ago
2:5=_:10=_:15=_:20=_:25= 12:_
ivolga24 [154]

Answer:

4, 6, 8, 10, 30

Step-by-step explanation:

5 0
3 years ago
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