Answer:
64.0874 or 20.41pi
Step-by-step explanation:
circumference = diameter x pi
C = D x pi
C = 20.41pi(lets say pi is 3.14)
C = 64.0874
Answer:
Credit remaining after 21 minutes = $30.4
Step-by-step explanation:
Credit remaining on a phone card is a linear function of the total calling time.
When graphed, let the linear function representing the line is,
y = mx + b
Where 'm' = slope of the line
b = y-intercept
From the graph,
Slope of the line = -0.12
y = -0.12x + b
If this line passes through a point (33, 28.96),
28.96 = -0.12(33) + b
b = 28.96 + 3.96
b = 32.92
Therefore, the linear function is,
f(x) = -0.12x + 32.92
where x = calling time
Credit left in the card after 21 minutes,
f(21) = -0.12(21) + 32.92
= -2.52 + 32.92
= $30.4
Answer:
x =9/4
Step-by-step explanation:
log3(4x) = 2
Raise each side to the base of 3
3^ log3(4x) = 3^2
We know that 3log3 is 1
4x = 9
Divide each side by 4
4x/4 = 9/4
x = 9/4
Answer:
78
Step-by-step explanation:
First we want 9 3/4 into an improper fraction.
(9 * 4) + 3 / 4 = 39 / 4
Then we want to change 39 / 4 into the same denominator as 1/8
39 / 4 * 2 = 78 / 8
And there is your answer, 78!
(hopefully this is correct, have a nice day!)
