Area of a circle is π*r²
sub what we're given
49π= πr²
49π= π*r²
r²= 49π/π
r²=49
r=7
The diameter is twice the radius therefore the diameter is 14 units
Answer: We are 95% confident that the population mean time that college students work is between 4.63 and 12.63 hours a week.
Step-by-step explanation:
When ever a percentage confidence interval is constructed, the answers that we have simply implies that we are x% sure ( Where x is the confidence level) that our value for interval is between the ones that we just got.
Going by our question, it implies that we are 95% sure that an average students work between 4.63 and 12.63 hours in a week
Answer: D
Step-by-step explanation: right on edge :)
There are 120 different possible groups.
(10 * 9 * 8)/(3 * 2 * 1) + 120
Answer:
x = 20°
y = 30
Step-by-step explanation:
The triangle given on close inspection, it is an equilateral triangle.
Each angle in an equilateral triangle is equal. Likewise, each side is equal.
Thus;
16 + y = 46
y = 46 - 16
y = 30
The triangle that has angle 80°, the other complete angle is 60° because it's an angle of an equilateral triangle.
Thus, the smaller angle there is;
180 - (80 + 60) = 40°
Because sum of angles in a triangle is 180°
Now, x + 40 = 60°
Since that's also an angle of an equilateral triangle.
x = 60 - 40
x = 20°