Answer:
I need the time as well to solce it
The expression a/b ÷ c/d = ad/bc is A. true.
Given to show that if a/b and c/d are rational expressions, then a/b ÷ c/d = ad/bc.
The ratio of two polynomials is an example of a rational expression. If an expression f is rational, it can be expressed in the form p/q, where p and q are polynomials.
Here we have a ,b ,c and d in the form of p/q form.
We take the reciprocal of the expression on the right side of the division sign when the rational expression a/b is to be divided by the rational expression c/d.
so, L.H.S = a/b ÷ c/d
= a/b × 1/(c/d)
= a/b × d/c
= ad/bc
= R.H.S
since L.H.S = R.H.S
a/b ÷c/d = ad/bc
Hence the expression a/b ÷ c/d = ad/bc is A.true.
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If A/B and C/D are rational expressions, then: A/B ÷C/D
Learn more about "rationlal expressions" here-
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Answer:
angle A=68°
angle B=68°
angle D= 111°
Step-by-step explanation:
angle D = angle C
angle D = 111°
interior angle of a quadrilateral=360°
angles A and B are equal . represent them by a°
a°+a°+111°+111°=360°
2a°+222°=360°
2a°=360°-222°
2a°=138°
2a°/2=138°/2
a°=68°
therefore angle A=68° and angle B =68°