Answer:
x = 20°
Step-by-step explanation:
by angle sum property of triangle
30 + 130 + x = 180
x = 180 - 160
<h2>x = 20°</h2>
<span>She could round this number
may it be in the tens and hundreds place. When rounding off a number, one
should consider the place of the digit he or she would like to round it off to.
One should consider what number is placed at the right of the rounding number.
If the number is below 5, then that digit should remain and the rest of the
digits to the right should be turned to 0s. </span>
The answer is 36 because -36 turns into 36
11.70 gallons....................................
Answer:
The bottom one ....see below
Step-by-step explanation:
Using reference angle of pi/8 and half angle trig identity:
cos ( angle/2) = -sqrt (1 + cos (angle) /2)
cos ( pi/4 / 2) = - sqrt (1+ cos ( pi/4)/2)
<u> cos (pi/8)</u> = - sqrt (1 + sqrt (2) / 2)
= - sqrt (1 + sqrt 2) / sqrt 2 rationalize the denominator
= - sqrt ( sqrt 2 + 2) / 2
re arrange to
- sqrt ( 2 + sqrt2) / 2 the fourth answer
