Answer:
An exponential equation is when we let the the independent variable become the exponent.
4b²+20b+25=0
Divide everything by 4
b²+5b+ 6.25=0
use the quadratic formula
x= (-b+ or - √b²-4ac) /2a
x= (-5 + or - √5²-4*1*6.25) /2(1)
x= -5/2 so
in this case, b= -5/2
I think you meant "y = 4 arccot (x)."
This is equivalent to:
y
---- = arccot x
4
and so cot (y/4) = x
Each student pays 7.25 for lunch.
Multiply that by 25 for the total lunch cost: 25 * 7.25 = 181.25.
Subtract the lunch total from the total cost to find the total ticket amount:
443.75 - 181.25 = 262.50
Now divide total ticket amount by 25 students to find the cost of one ticket:
262.50 / 25 = $10.50
The first choice is the correct answer.
22.50 per hr for 4.5 hrs = 101.25...work pay
35 miles at 0.50 per mile = 0.50(35) = 17.50...travel pay
parts : 350 * 1.05 = 367.50...parts and taxes
total : 101.25 + 17.50 + 367.50 = 486.25
486.25 - 468.75 = 17.50.
answer is : The invoice is incorrect....he did not charge for travel <==