30% of the 30 marbles is nine and 9-30 = 21 so your answer is 21
Answer:
Step-by-step explanation:
Notice that 
.
The diagram already marks 
, so we just need to find 
.
and 
are vertical angles, which means they are equal in measure.
Therefore,
Since there are 
on each side of a line, we have the following equation:
.
Plugging in 
, we have:
.
Therefore,
.
Isolate the variable by dividing each side by factors that don't contain the variable. p=q/2r
Since the trapezoid can be inscribed in a circle, that means angle B + angle D = 180 degree. Since AB is parallel to CD, then angle B + angle C = 180 degree. Therefore, angle D = angle C.
The measure will be 122 cause all you have to do is subtract 180 from 58 and you will get your answer cause a supplementary angle is an obtuse so thats 180 so you would have to subtract then two amd you will get your answer !!
