Which equations are true for the values of x, y, and z? Select three options.
1 answer:
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Answer:
The wavelength, of a sound wave with a frequency of 20 waves per second is 15,000,000 m.
Step-by-step explanation:
In this question, we have to calculate the wavelength of a sound wave of frequency 20 waves per second.
We know that the speed of light in air/ vacuum is .
Now by the formula v = nλ , where v = speed of light in air/vacuum, n = frequency of the wave and λ = wavelength in meters,
we put the values
= 20 × λ
λ =
λ = 15,000,000 m
Answer: 10.5 minutes
Step-by-step explanation:
Given: Time taken to read each page of health book = 0.8 minutes
Time taken to take the test at the end = 5.5 minutes
Let x be the number of pages of book to read, then time taken to read pages and take the test is given by :-
If we read 6.25 pages, then time taken to read 6.25 pages and take the test is given by :-
Answer: 21
Step-by-step explanation:
Given: Number of mango guava and sapota are supplied 108,84 and 60 respectively.
Since, 108 = 2 x 2 x 3 x 3 x 3
84 = 2 x 2 x 3 x 7
60 = 2 x 2 x 3 x 5
HCF(108,84,60) = 2 x 2 x 3 [HCF=Highest common factors]
= 12
Greatest number of plants in each row = 12
Number of rows for mango =
Number of rows for guava =
Number of rows for sapota =
Total rows = 9+7+5= 21
Hence, the minimum number of rows in which they can be planted if in each row same numbers of saplings of the same type are to be planted = 21