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Leni [432]
3 years ago
8

Calendar: discount, 75%, sale price, $2.25, find the orignal sale price

Mathematics
2 answers:
Monica [59]3 years ago
8 0
The original cost is $3.00.

Hope this helps and if someone else comments put mine brainliest.
Setler [38]3 years ago
4 0
Not sure if it was discounted by 75% or it ended up 75% of original


if it was discounted by 75%
100-75=25
25%=2.25
times 4 both sides
100%=$9.00

if it was 75% of the original price
75%=2.25
divivde both sides by 3
25%=0.75
times  4 both sides
100%=$3.00



if it was discounted by 75% then original is $9.00
if it was 75% of original price after discount then original is $3.00
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We need to find the rectangular coordinates of the given point.

If a polar coordinate is (r,\theta), then  

x=r\cos theta

y=r\sin theta

In the given point \left(7,\dfrac{2\pi}{3}\right),

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Now,

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x=-7\left(\dfrac{1}{2}\right)

x=-\dfrac{7}{2}

and,

y=7\sin \dfrac{2\pi}{3}

y=7\sin \left(\pi-\dfrac{\pi}{3}\right)

y=7\sin \left(\dfrac{\pi}{3}\right)

y=7\left(\dfrac{\sqrt{3}}{2}\right)

y=\dfrac{7\sqrt{3}}{2}

Therefore, the required point is \left(-\dfrac{7}{2},\dfrac{7\sqrt{3}}{2}\right).

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