Answer:
x = 5
Step-by-step explanation:
(2x+2)² - (2x)² = 44
4x^2 + 8x + 4 - 4x^2 = 44
8x + 4 = 44
8x = 44 - 4
8x = 40
x = 40/8
x = 5
Answer:
a) The modal class for this case represent the class with the highest frequency
And for this case would be
with the highest frequency 8
b) 
Step-by-step explanation:
Part a
The modal class for this case represent the class with the highest frequency
And for this case would be
with the highest frequency 8
Part b
For this case we need to find the mid point of each interval:
Interval Midpoint Frequency
18-20 19 3
20-22 21 2
22-24 23 7
24-26 25 8
And we can find the sample mean with this formula:

And replacing we got:

- 133 > -7(2x+3)
-133 > -14x - 21
-133 + 21 > -14x
-112 > -14x │ × (-1)
112 < 14x
14x > 112
x > 112/14
x > 8
Answer:
17
Step-by-step explanation:
3 + 7 * 6 / 3
PEMDAS says we multiply and add before adding and subtracting so we multiply first (going from left to right)
3 + 42 / 3
Then we divide
3 + 14 = 17