Answer:
(x - 3)(x + 3)
Step-by-step explanation:
a² - b² = (a - b)(a + b)
x² - 9 = (x - 3)(x + 3)
Its increasing 40 miles for every hour
Answer:
20
Step-by-step explanation:
Answer:
15 black water bottles
Step-by-step explanation:
let w represent white water bottles, and let b represent black water bottles.
set up a system of equations:
w+b=20
w+2b=35
(the top equation shows that the number of white water bottles he sold and the number of black water bottles he sold equals to 20, since it says that the total number of water bottles is 20. the bottom equation shows that white water bottles cost $1, and black water bottles cost $2, and that the total amount of money he got from selling them is $35).
in the top equation, isolate w:
w+b=20
w=20-b
now we do substitution. in the bottom equation, substitute 20-b for w:
w+2b=35
20-b+2b=35
then, solve:
b+20=35
b=15
this means that he sold 15 black water bottles.
Answer:
yes
Step-by-step explanation:
We need to check if the circle with a circumference of 15 feet is smaller then 7 feet. If so it possible.
Formule for circular circumference = pi * diameter, which should be 15.
So pi * d =15
There fore d = 15/pi
d = 4.77464829275686 feet, which is smaller then 7 feet, so it will fit easilly.
