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CaHeK987 [17]
3 years ago
7

Susana has 4 academy shirts, 3 pairs of jeans and 5 pairs of sneakers. How many different outfits can she make consisting of one

shirt, one pair of jeans and one pair of sneakers? *
5 points
Mathematics
1 answer:
tekilochka [14]3 years ago
7 0

Answer:

60

Step-by-step explanation:

It depends if they all match or not.  If they all match, you could make 60 outfits (as everyone says - 5 x 4 x 3 = 60).  These are all the possible combinations, assuming you don't include shirtless or shoe-less options.:

1 Shirt 1 Pants 1 Shoe 1

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The area of a square garden is 1/36 mi 2 how long is each side<br><br>​
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Celia bought a bag of 1212 goldfish for \$3$3. What is the cost of 11 goldfish?
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Answer:  see proof below

<u>Step-by-step explanation:</u>

Given: cos 330 = \frac{\sqrt3}{2}

Use the Double-Angle Identity: cos 2A = 2 cos² A - 1

\text{Scratchwork:}\quad \bigg(\dfrac{\sqrt3 + 2}{2\sqrt2}\bigg)^2 = \dfrac{2\sqrt3 + 4}{8}

Proof LHS → RHS:

LHS                          cos 165

Double-Angle:        cos (2 · 165) = 2 cos² 165 - 1

                             ⇒ cos 330 = 2 cos² 165 - 1

                             ⇒ 2 cos² 165  = cos 330 + 1

Given:                        2 \cos^2 165  = \dfrac{\sqrt3}{2} + 1

                              \rightarrow 2 \cos^2 165  = \dfrac{\sqrt3}{2} + \dfrac{2}{2}

Divide by 2:               \cos^2 165  = \dfrac{\sqrt3+2}{4}

                             \rightarrow \cos^2 165  = \bigg(\dfrac{2}{2}\bigg)\dfrac{\sqrt3+2}{4}

                             \rightarrow \cos^2 165  = \dfrac{2\sqrt3+4}{8}

Square root:             \sqrt{\cos^2 165}  = \sqrt{\dfrac{4+2\sqrt3}{8}}

Scratchwork:            \cos^2 165  = \bigg(\dfrac{\sqrt3+1}{2\sqrt2}\bigg)^2

                             \rightarrow \cos 165  = \pm \dfrac{\sqrt3+1}{2\sqrt2}

             Since cos 165 is in the 2nd Quadrant, the sign is NEGATIVE

                             \rightarrow \cos 165  = - \dfrac{\sqrt3+1}{2\sqrt2}

LHS = RHS \checkmark

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