Answer:
8 gallons
Step-by-step explanation:
Total gas in the car = 14 gallons
Each hour gas usage = 1.5 gallons
Total hours traveled = 4 hours
Left gas after 4 hours
= 14-1.5(4)
=14-6
=8 gallons
Left gas after t hours
=14-1.5t
Hence the answer is after 4 hours, 8 gallons are left after t hour(s) 14-1.5t
Answer:
P = 1310
Step-by-step explanation:
Mark Brainliest!
Answer:
55.8292 cm
Step-by-step explanation:
Circumference is diameter x pi.
7 x 3.14 = 21.98 inches
21.98 x 2.54 = 55.8292 cm
Is that supposed to be x² -4x -5 = 0 or x²-4-5=0 as written? We'll do both.
As written it's
x²=9 so x=±3, no quadratic formula required.
Let's assume you meant
x² -4x - 5 = 0
So much temptation. This factors as
(x-5)(x+1)=0 so roots x=5, x=-1. But that didn't use the quadratic formula..
There's a shortcut to the quadratic formula called the Shakespeare Quadratic Formula (2b or -2b) that's useful when the linear term is even.
In that case x²-2bx+c has zeros at z=b±√(b²-c)
x = 2 ± √(4 - -5) = 2 ± √9 = 2 ± 3 = { -1 , 5 }
OK, let's do it like they want
x² - 4x - 5 = 0
We have a=1, b=-4, c=-5 and the quadratic formula
Answer: x=-1 or x=5
X >_(-5)
The third option from the left.