Answer:
8.553
Step-by-step explanation:
hope this helped
For this case we have the following expression:
(6.21 + 0.93) + 0.07
We apply the associative property of the addition to rewrite the expression.
This property indicates that, when there are three or more terms in these operations, the result does not depend on the way in which the terms are grouped.
We have then:
6.21 + (0.93 + 0.07)
Answer:
6.21 + (0.93 + 0.07)
Associative property.
Answer:
x^2+2x+2
Step-by-step explanation:
If the roots of the equation are -1\pm i, then by the zero product rule:
![x=-1\pm i \\\\x+1\pm i=0 \\\\(x+1+i)(x+1-i)=0\\\\x^2+x-ix+x+1-i+ix+i+1=0 \\\\x^2+2x+2=0](https://tex.z-dn.net/?f=x%3D-1%5Cpm%20i%20%5C%5C%5C%5Cx%2B1%5Cpm%20i%3D0%20%5C%5C%5C%5C%28x%2B1%2Bi%29%28x%2B1-i%29%3D0%5C%5C%5C%5Cx%5E2%2Bx-ix%2Bx%2B1-i%2Bix%2Bi%2B1%3D0%20%5C%5C%5C%5Cx%5E2%2B2x%2B2%3D0)
You can confirm this with the quadratic equation:
![x=\dfrac{-2\pm\sqrt{4-8}}{2}=\dfrac{-2\pm 4i}{2}=-1\pm i](https://tex.z-dn.net/?f=x%3D%5Cdfrac%7B-2%5Cpm%5Csqrt%7B4-8%7D%7D%7B2%7D%3D%5Cdfrac%7B-2%5Cpm%204i%7D%7B2%7D%3D-1%5Cpm%20i)
Hope this helps!
Answer:
The measure of arc EBC is 220°
Step-by-step explanation:
step 1
Find out the measure of angle COB
we know that
m∠COB+m∠DOC=90° -----> given problem
we have that
m∠DOC=m arc DC -----> by central angle
m arc DC=50°
so
m∠DOC=50°
Find m∠COB
m∠COB+50°=90°
m∠COB=40°
step 2
Find out the measure of arc BC
we have that
m arc BC=m∠COB -----> by central angle
m∠COB=40°
therefore
m arc BC=40°
step 3
Find out the measure of arc EBC
we know that
m arc EBC=m arc EB+m arc BC
m arc EB=180° -----> because the diameter divide the circle into two equal parts
so
m arc EBC=180°+40°=220°
Use cos sin and tan and looks up rules of cos sin tan and it will show you the rules and use those methods to plug into your equation