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:
<em>Hi there the correct answer is</em>
sum: 5x+1
term: 9(5x+1) and 3y
product: 9(5x+1)
factor: 9 and 5x+1
quotient: not present
coefficient: 3 and 5
hope it helps!
Answer:
Step-by-step explanation:
gs used in 180 mile=10 gallons
gas used in 1 mile=10/180=1/18
gas used in 450 mile=1/18×450=25 gallons
You use pi in the equation to find the circumference and/or area of a circle.
45 degrees.
180 degrees in one triangle.
90 is a right angle.
45 for each of the other angles. Add them together you get 90.
Two 90 degree angles will get you a right triangle.
hope this helps
