Cos²x+2cos x+1=0
We have to do a change of variable.
cos x=t
Then, we have the next square equation.
t²+2t+1=0
We solve this square equation:
t=[-2⁺₋√(4-4)]/2=-1
if cos x=t then we have that:
cos x=-1
x=cos⁻¹ -1= π radians or 180º.
Answer: x=π (in radians) or x=180º (in degrees).
Answer:
<u>B. spin a spinner with 4 equal sections two times.</u>
Step-by-step explanation:
There are 4 boys and 2 girls in the Science Club.
2 members will give the demonstration at the science fair.
And at least one of the demonstrators will be a girl.
So, it is convenient to choose a simulation method with 4 outcomes.
The suitable simulation is spin a spinner with 4 equal sections two times.
The first time of the spinner we will choose a boy, each section from the four section will represent one boy.
The second time, we will choose a girl, each 2 section from the four sections will represent one girl.
<u>The answer is option B. spin a spinner with 4 equal sections two times.</u>
Answer:
46.7%
Step-by-step explanation:
Given:
Total number of students in Mrs. Verner's class = 15
Number of girls = 8
To find: percentage are boys
Solution:
Percentage of boys = ( Number of boys / Total number of students ) × 100
Number of boys = Total number of students - Number of girls = 15 - 8 = 7
So,
Percentage of boys = × 100 = 46.7%
Answer:
Suzie's answers are incorrect.
Step-by-step explanation:
x^2+4x-12=2
+12 +12
x^2+4x=14
(if we put Suzie's answer in for x)-
2^2+4(2)=14
4+8=14
Suzie's first answer is incorrect (4+8=12)
Let's try the next one with Suzie's answer
(-6-2)(-6+6)=2
(-8)(0)=2
This answer is also incorrect. (-8*0=0)
27+56=83 IDK I GUESS THATS YOUR ANSWER