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worty [1.4K]
3 years ago
7

someone please please please answer these for me and make sure they are written out in steps pls and tysm!!

Mathematics
1 answer:
laila [671]3 years ago
4 0
2, 2 ,15 percent in each one
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The list price for a window is $220. Net price is $160. What is the trade discount rate?
Artist 52 [7]
220-220r=160
Solve for r to get the discount rate
r=0.2727
r=0.2727×100
r=27.27%

Check
220−220×0.2727
=160
3 0
3 years ago
Read 2 more answers
Can somebody help please??<br> urgently
VMariaS [17]

The perimeter of the shaded part is 3.93 cm.

Step-by-step explanation:

Step 1; The perimeter of a circle is calculated by multiply 2π with the radius. This given circle is not an entire circle. An entire circle has an angle if 360° while this has an angle of 50°. So we divide 360° with 50°.

Number of these shapes to form a full circle = 360° / 50° = 7.2. So 7.2 of these shapes will need to be combined to form a full circle. So we can calculate the perimeters of full circles and then divide it by 7.2 to get the parameters of the given sections.

Step 2; The parameter and circumference of a circle are equal. So

The perimeter of shaded region = Perimeter of the entire region - Perimeter of the unshaded region.

The Perimeter of circle with radius 8cm = 2π × 8 = 50.2654 cm.

The perimeter of the given shape = \frac{50.265}{7.2} = 6.9813 cm

The perimeter of circle with radius, 3.5cm (8cm - 4.5cm) = 2π × 3.5 = 21.9911 cm,

The perimeter of unshaded region = \frac{21.991}{7.2} = 3.0543 cm.

So the perimeter of shaded region = 6.9813 cm - 3.0543 cm = 3.927 cm.

Rounding 3.927 to 3 significant figures we get the perimeter of shaded region equal to 3.93 cm.

8 0
3 years ago
11. Find the exact value by using a half-angle identity. (1 point)
ValentinkaMS [17]
<span>11. Find the exact value by using a half-angle identity. 
</span><span>sin (22.5)
</span><span>the sine half-angle formula
</span>

sin<span>(x/2)</span>=±((1−cos(x))/2) ^0.5         cos 45=(2^0.5)/2

sin(22.5)=±((1−cos(45))/2) ^0.5

sin(22.5)=±((2-2^0.5))^0.5/2

sin(22.5)=±0.3826834324

<span>
12. Find all solutions to the equation in the interval [0, 2π)
</span>cos x = sin 2x
cosx-sin 2x=0
<span>using a graphical tool
</span>in the interval [0, 2π)

<span>the solutions are
x1=0----------------not solution
x2=</span>π/6------------ not solution<span>
x3=</span>π/2------------ is a solution<span>
x4=5</span>π/6---------- not solution<span>
x5=3</span>π/2---------- is a solution

<span>the answer is the letter <span>a) pi divided by two. , three pi divided by two

</span></span>

13. Rewrite with only sin x and cos x. sin(2x) = 2*sin(x)*cos(x)

sin 2x - cos x=2*sin(x)*cos(x)- cos x= cos x*(2*sin(x)-1)

<span>the answer is  the letter <span>c) cos x (2 sin x - 1)

</span></span>

<span>14. Verify the identity. 
cosine of x divided by quantity one plus sine of x plus quantity one plus sine of x divided by cosine of x equals two times secant of x</span>.

cosx/(1+sinx) + (1+sinx)/cosx 

<span>
= (cosx * cosx + (1+sinx)(1+sinx)) / (cosx (1+sinx)) 
= (cos²x + sin²x + 2 sinx + 1) / (cosx (1+sinx)) 
= (1 + 2 sinx + 1) / (cosx (1+sinx)) 
= (2 + 2 sinx) / (cosx (1+sinx)) 
= 2 (1+sinx) / (cosx (1+sinx)) 
= 2/cosx 
<span>= 2 secx  Ok is correct</span></span>

6 0
3 years ago
Which equation means five less than a number is equal to 19?
ss7ja [257]
The answer is c because a subtraction sign means less
3 0
3 years ago
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Random khan question and I haven't done this in a year, I'm struggling.
Stolb23 [73]

Answer:

Add maybe

Step-by-step explanation:

add the 500+400+200 try that hope it helps have a great day

8 0
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