Answer:
280
Step-by-step explanation:
Margin of error = critical value × standard error
Here, the margin of error is 2.
At 99% confidence, the critical value is z = 2.576.
The standard error is s / √n = 13 / √n.
2 = 2.576 (13 / √n)
2 = 33.49 / √n
√n = 16.74
n = 280.4
Rounded to the nearest person, the required sample size is 280.
Yea, sure thing...
So like, in a quadrilateral the sum of its angles will form 360°.
So,
(2x - 16)° + 2x° + x° + (x + 10)° = 360°
2x - 16 + 2x + x + x + 10 = 360
2x + 2x + x + x - 16 + 10 = 360
6x - 6 = 360
6x = 360 + 6
6x = 366
x = 366 ÷ 6
x = <u>6</u><u>1</u><u>.</u>
m<R = 2x° = 2 × 61 = <em><u>1</u></em><em><u>2</u></em><em><u>2</u></em><em><u>°</u></em><em><u>.</u></em>
Hope it helps ya mate :))
Answer:
9n -10
Step-by-step explanation:
If n represents the number, the product of the number and 9 is 9n. That value decreased by 10 is ...
9n -10
_____
<em>Additional comment</em>
The English expression is ambiguous in that we cannot tell if the number is decreased by 10 before becoming part of the product (9(n-10)), or if the correct interpretation is the one shown above. The order of operations is used as a guide, telling us that the multiplication is done before the subtraction since there is no indication of grouping.
A circle is 360 degrees so if we divide it in 5 equal parts each part must be 72 degrees. (360/5= 72)
So if each part is 72 degrees, then 4 parts are 4x72=228 degrees