Calculate cos to two decimal places.

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Step-by-step explanation:

To calculate the cosine of angle θ we need the law of cosines:

c²=a²+b²-2*a*b*cosθ.

In our case a=7, b=8 and c=11. We solve for cosθ:

-2*a*b*cosθ=c²-a²-b², we divide by -2*a*b and get:

cosθ=(c²-a²-b²)/(-2*a*b)=-1/14=-0.07.

So the correct answer is A.  -0.07.

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%