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3 years ago

Beth sold half of her comic books and then bought 9 more. she now has 28. with how many did she begin? please show work. thanks

Mathematics

2 answers:

aivan3 [116]3 years ago

8 0

28+9=37, 37+37=74, so the answer is 74 comic books. If I left out anything, tell me.

GenaCL600 [577]3 years ago

3 0

28-9=19 and 19*2=38, so she began with 38 comic books

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<h3>Given information</h3>

We given a circle (the dartboard) with diameter of $20in$ , divided into 20 equal(or, congruent) sectors

<h3>Part I: Finding the central angle</h3>

To find the central angle, divide $360^\circ$ by the number of sectors. Let $\alpha$ denote the central angle, then

$\alpha=\dfrac{360^\circ}{20}\\\\\alpha=18^\circ$

<h3>Part II: Find the fraction of the circle that one sector takes</h3>

The fraction of the circle that one sector takes up is found by dividing the angle a sector takes up by $360^\circ$ . The angle has already been computed in Part I (the central angle, $\alpha$ ). The fraction is

$f=\dfrac{\alpha}{360^\circ}\\\\f=\dfrac{18^\circ}{360^\circ}=\dfrac{1}{20}$

<h3>Part III: Find the area of one sector to the nearest tenth</h3>

The area of one sector can be gotten by multiplying the fraction gotten from Part II, with the area formula. That is

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Learn more about sectors of a circle brainly.com/question/3432053

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