Using the distributive property, we have -12w^2-2w since a(b+c)=ab+ac
Hope this helped
Answer:
120 miles in 4.8 hours
75 miles in 5 hours
Step-by-step explanation:
Ship:
The number f(x) of miles a ship is from its destination x hours after starting a voyage is given by f(x) = 120 - 25x. This means, initially the ship is 120 miles away from its destination.
If the ship traveled 120 miles, then f(x)=0 (the ship will be 0 miles away from its destination) and
0 = 120 - 25x
25x = 120
x = 4.8 hours.
Submarine:
At x = 0 hours the submarine was 75 miles away
At x = 5 hours, the submarine was 0 miles away.
So, in 5 hours the submarine traveled 75 miles
Answer:
x = 0 .
-20/19 (see below).
Step-by-step explanation:
√(x + 1) + √5x = √(7x + 1)
Squaring both sides:
x + 1 + 5x + 2√(x + 1)√5x = 7x + 1
2√(x + 1)√5x = 7x +1 - 1 - x - 5x = x
Squaring both sides:
4(x + 1)(5x) = x^2
20x^2 + 20x - x^2 = 0
19x^2 + 20x) = 0
x(19x + 20) = 0
x = 0, -20/19.
If we substitute x = 0 into the original equation we get
√(0 + 1) + √5*0 = √(7*0 + 1)
1 = 1 so this is a true solution.
-20/19 :- √(-20/19 + 1) is not real so unless we allow complex square root this is extraneous.
So 3 pounds cost 4$ and we need to figure out how much it is to purchase 1 pound of them.
All you need to do is divide the given cost by the given amount of pounds.
4 / 3 = 1.33333333333
<h3>So 1 pound will cost 1.33$</h3>
Hope this helps!
Answer:
8
Step-by-step explanation:
Since we are adding small numbers we can use our hands to solve it.
1) We can use one hand to represent the value of 5
2)We use the other hand and lift tree fingers up.
3)counting the fingers will give you a total of 8
