Answer:
20
Step-by-step explanation:
To calculate the sum of the residuals, subtract the predicted sales from the actual sales in the table below.
Actual sales 55 150 325 510 780 990
Predicted sales 40 150 300 500 800 1,000
This will show the change between them. Add each residual to find the sum.
55 - 40 = 15
150 - 150 = 0
325 - 300 = 25
510 - 500 = 10
780 - 800 = -20
990 - 1000 = -10
These add up to be 15 + 25+ 10 +-20 +-10 = 20
First, let's simplify this a bit ok?

Now, as a decimal: 3.5
As percent you multiply the number by 100 % (which is 1, and you an always multiply by 1):
3.5 *100%=350 %.
I think this is the answer ( −∞,∞)
Given:
Solution:To solve the equation, it would be best if we remove the root. We remove the root by squaring the equation, but first we need to move the root and the content to the left side.


Then square both side to remove the root

After removing the root, move all terms to the left side
sec² x - 2 sec x + 1 = 0
Do factorization, remember that
a² - 2a + 1 = (a - 1)²
So,
sec² x - 2 sec x + 1 = 0
(sec x - 1)² = 0
sec x - 1 = 0
sec x = 1

= 1
cos x = 1
cos x = cos 0°
x = 0°
Plug in the x and y values to check if it is true.
5=3(2)-1
5=6-1
5=5
Final answer: Yes