29 and 30 and plz explain

Mathematics

1 answer:

erik [133]4 years ago

6 0

27. B
28. 800 more people
29. He should receive $11.20 back. I came up with this by taking 81 (the total cost of the items) and subtracting 15%. After that, I got 68.85-the price after using the coupon. Then, I added the total amount of money he had and came up with 80 (he had 4 twenty dollar bills). Finally, I took away 68.85 from 80 and ended with the answer 11.20.
30. Store b is offering a better deal for the shoes. After using the percent discount for store a, I came up with 59.50. However, when I did the same with store b, I ended with 51.30, the better deal of the two stores.

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see below

Step-by-step explanation:

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3 years ago

30 POINTS HELP ANSWER ASAP AND EXPLAIN STEP BY STEP HOW TO SOLVE The two non-parallel sides of an isosceles trapezoid are each 7

weeeeeb [17]

See diagram
I wrote that the degrees are 70 each because it is isocolese and 140/2=70

a.
to solve for the diagonal, I'm going to use trig to find the height and the base then use pythagorean theorem to find the diagonal

so
see I've drawn an auxiliry line to make a right triangle on the leftmost side
so
we want to find the height and base
sin(70°)=h/7
so 7sin(70°)=h≈6.57785

cos(70°)=base/7
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now
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use pythagorean theorem, like 6.57785²+19.6059²=diagonal²
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b.
we got that the base was 7cos(70°)
2 of those bases so 22-14cos(70°)=17.2117ft or rounded 17.21ft

a. 20.68ft
b. 17.21ft