Find the value of x for which ABCD must be a parallelogram.
2 answers:
<h2>Answer:</h2>
The value of x is:
We know that a parallelogram is a polygon with two pair of parallel sides which are congruent.
Based on the figure we get that side AD is congruent to side BC.
This means that:
on subtracting x from both the sides of the equation we have:
Now on adding 1 on both the sides of the equation we have:
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Answer:
The sample size to obtain the desired margin of error is 160.
Step-by-step explanation:
The Margin of Error is given as
Rearranging this equation in terms of n gives
Now the Margin of Error is reduced by 2 so the new M_2 is given as M/2 so the value of n_2 is calculated as
As n is given as 40 so the new sample size is given as
So the sample size to obtain the desired margin of error is 160.
Answer:b
Step-by-step explanation:
Given
Hilda draws a card from a deck of cards and it is seven.
It is certain that card is 7 so there a 4 cards which can be 7
i.e. 7 of hearts,7 of spades,7 of club,7 of diamond
So probability that it is the 7 of spades is