I need help with my khan, plz help meeee (7th-grade math)
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<u>Given</u>:
Given that RST is a right triangle.
The measure of ∠R is 35°.
The length of ST is 12 units.
The length of the hypotenuse is t units.
We need to determine the value of t.
<u>Value of t:</u>
The value of t can be determined using the trigonometric ratio.
Thus, we have;
where , the side opposite to ∠R is ST and hypotenuse is SR.
Substituting these values, we get;
Substituting ST = 12 and SR = t, we get;
Simplifying, we get;
Thus, the value of t is 20.9 units.
The cardinality of the union between two sets is given by
In fact, if an element is in both A and B, it is counted in both N(A) and N(B), so we're counting it twice. By subtracting the cardinality of the interserction, we're taking back one of these "extra-counted" element, and the count is correct. In your case, the numbers are
This means that the two sets cover, without repetitions, 43 of the 66 elements in the sets. So, there are
elements which are in neither A nor B