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marusya05 [52]
3 years ago
14

What's the recommend amount of UV protection that sunglasses should provide?

Mathematics
2 answers:
BabaBlast [244]3 years ago
7 0
They should screen out 99 to 100 percent of uv rays. Hope this helps!
olga55 [171]3 years ago
6 0
Sunglasses that block 100 percent<span> of the harmful UV and have good optical quality.</span>
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I need help with these quadratic applications.<br>​
Kitty [74]

Answer:

1. d

2. c

Step-by-step explanation:

1. "You have a 12in by 14in picture you framed.  When you hung the picture, you found that the area is 261.44 square inches.  What is the width of the frame?"

If we call the width of the frame x, then the total width is w = 12 + 2x, and the total height is 14 + 2x.  Area is width times height, so:

A = wh

261.44 = (12 + 2x) (14 + 2x)

Distribute using FOIL (first outer inner last):

261.44 = 12×14 + 12×2x + 2x×14 + 2x×2x

261.44 = 168 + 24x + 28x + 4x²

261.44 = 168 + 52x + 4x²

0 = 4x² + 52x − 93.44

0 = x² + 13x − 23.36

Solve with quadratic formula:

x = [ -b ± √(b² − 4ac) ] / 2a

x = [ -13 ± √(169 + 93.44) ] / 2

x = (-13 ± 16.2) / 2

x = 1.6 or -14.6

Since x must be positive, x = 1.6 inches.

2. "A flower garden has been design with an L shaped walkway and viewing area around two sides as shown.  The garden itself is 5 yards by 8 yards.  The total area needed to build this landscape design is 60.9525 square yards.  What is the width of the walkway?"

If we call the width of the walkway x, then the total width is w = 5 + x and the total length is l = 8 + x.  Area is width times length, so:

A = wl

60.9525 = (5 + x) (8 + x)

Distribute using FOIL (first outer inner last):

60.9525 = 5×8 + 5×x + x×8 + x×x

60.9525 = 40 + 5x + 8x + x²

60.9525 = 40 + 13x + x²

0 = x² + 13x − 20.9525

Solve with quadratic formula:

x = [ -b ± √(b² − 4ac) ] / 2a

x = [ -13 ± √(169 + 83.81) ] / 2

x = (-13 ± 15.9) / 2

x = 1.45 or -14.45

Since x must be positive, x = 1.45 yards.

6 0
3 years ago
Read 2 more answers
Suppose that mean retail price per gallon of regular grade gasoline is $3.45 with a standard deviation of $0.10 and that the ret
Elan Coil [88]

Answer:

90% of people marry there 7th grade love. since u have read this, u will be told good news tonight. if u don't pass this on nine comments your worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of your life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love you

Step-by-step explanation:

7 0
3 years ago
Which of the following choices is the x intercept of the equation 2y-x=-6
Rashid [163]

Answer:

x = 6

Step-by-step explanation:

Given

2y-x=-6

Required

Determine the x intercept

To get the value of x intercept; we simply substitute 0 for y;

i.e. y = 0

2y-x=-6 becomes

2(0)-x=-6

0-x=-6

-x=-6

Multiply both sides by -1

-1 * -x=-6 * -1

x=-6 * -1

x = 6

<em>Hence, the x intercept is 6</em>

6 0
3 years ago
Someone! Please help me!
marusya05 [52]
The lines are parralel

4 0
3 years ago
Read 2 more answers
What is the missing value , 2/3 and n/12
gavmur [86]
N=8
If you set 2/3 equal to n/12 then you multiple 3 by 4 to get 12. So you have to multiple 2 by 4 to get N.
8 0
2 years ago
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