8. If the perimeter of a square is 62 centimeters, what is its area?
2 answers:
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Answer:
B. 4
Step-by-step explanation:
The sign means greater than or equal to
The sign > just means greater than
4 is a solution for x 4, because 4 is equal to 4, but not a solution for x>4, because 4 is not greater than 4
Hope this helps! :)
The values of x and y are 8 and 0 respectively.
<em><u>Explanation</u></em>
As 'p' is located at (0,0) and 'r' is located at (-12,0) , that means both 'p' and 'r' are on the x-axis. So point 'q' will be also on the x-axis , and 'q' is located at (x,y)
So, the value of y will be 0. That means the co ordinate of point 'q' is (x, 0)
Now, using the Distance formula, length of 'pq'
and length of 'pr'
Given that, pq : pr =2/3
So....
Thus, the values of x and y are 8 and 0 respectively.
Answer:
c) use the student t- distribution.
t = 22.23
t= 22.23 > 1.645 at 149 degrees of freedom
Null hypothesis is rejected
Step-by-step explanation:
<u>Step (i)</u>:-
Given sample size 'n' =150
The mean RDA of sodium is 2400mg
The mean of the Population 'μ' = 2400mg
Given mean of the sample x⁻ = 3400
The standard deviation of the sample 'S' = 550
<u>Step(ii):</u>-
Null hypothesis :H₀: μ = 2400
Alternative hypothesis : H₁: μ ≠2400
The test of statistic
degrees of freedom γ= n-1 = 150 -1 =149
t₀.₉₅ = 1.645
<u>Conclusion:</u>-
t= 22.23 > 1.645 at 149 degrees of freedom
Null hypothesis is rejected
The mean RDA of sodium is not equal to 2400mg