<span>A) $ 0,01 ou 0,05 ......... </span>
Answer:
$31.20
Step-by-step explanation:
40% of 78 is 31.2
Answer:
126 people
Step-by-step explanation:
Given that, ratio of people who preferred tea to those who preferred coffee = 9:5
Let number of people who preferred coffee = x
Number of people who preferred tea = x + 36
Total number of people in survey = x + (x+36)
Ratio of people who preferred tea to those who preferred coffee = (x + 36)/x = 9/5
Cross multiply to solve for x
5(x + 36) = x(9)
5x + 180 = 9x
Subtract 5x from both sides
180 = 9x - 5x
180 = 4x
Divide both sides by 4
180/4 = x
45 = x
x = 45
<em>Number of people who preferred coffee = x = 45</em>
<em>Number of people who preferred tea = x + 36 = 45 + 36 = 81</em>
<em>Total number of people in the survey = x + (x + 36) = 45 + 81 = 126 people</em>
B = 2h
Area = 121
1/2 × b × h = 121
1/2 × 2h × h = 121
h × h = 121
h^2 = 121
h = square root of 121
h = 11
The height is 11 kilometers
i used polynomial division.. i hope this helps :)
