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Monica [59]
3 years ago
14

What is the missing coefficient of the x-term of the product (-x-5)^2

Mathematics
1 answer:
slava [35]3 years ago
5 0
(-x-5)^{2} = (-x-5)(-x-5)=x^{2}+10x+25

Coefficient of x term is 10.
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Martha estimated there were 96 marbles in a jar for a contest. The actual number of marbles in the jar was 118. What was the per
matrenka [14]
To find percent error, you subtract the actual number from your estimate, take the absolute value, and divide by the actual number.

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l -22 l
l 22 l
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Hope this helps!
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3 years ago
How do you solve sin (5pi/3) without a calculator?
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very simple, we use the formula sin(a+b)=sinacosb + sinbcosa and sin(20)=2sinacosa

5pi = 2pi/3+3pi/3,

First, we use sin(a+b)=sinacosb + sinbcosa

sin(5pi/3)=sin(2pi/3+3pi/3)= sin(2pi/3+pi)= sin(2pi/3)cos(pi) +sin(pi)cos(2pi/3)

but we know that sin(pi)= 0, and cos (pi) = -1, so sin(5pi/3)= - sin(2pi/3)

now, use sin(2a)=2sinacosa, sin(5pi/3)= - sin(2pi/3)= -2sin(pi/3)cos(pi/3)

sin<span>(5pi/3)=  -2sin(pi/3)cos(pi/3)</span>

<span>sin(pi/3)= 0.86, cos(pi/3)=0.5, finally we have   </span>sin<span>(5pi/3)=  -0.86 x 0.5= -0.43</span>

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