Answer:it’s A
Step-by-step explanation:
Answer:
D. 9 + 4√5
Step-by-step explanation:
What we're essentially doing here is squaring 2 + √5. (2 + √5 and 2 + 1√5 are essentially the same)
(2 + √5)(2 + √5) <em>(I didn't put the one on the conjugate for a reason; look above)</em>
<em>Step 1: Apply the distributive property by multiplying each term of 2 + √5 by 2 + √5</em>
4 + 2√5 + 2√5 + (√5)²
<em>Step 2: Combine 2√5 and 2√5 to get 4√5.</em>
4 + 4√5 + (√5)²
<em>Step 3: The square of √5 is 5.</em>
4 + 4√5 + 5
<em>Step 4: Add 4 and 5 to get 9.</em>
9 + 4√5 is the final answer to this question.
Answer:
0.47
Step-by-step explanation:
here is a life tip
to turn percents into decimals mmove the decimal point <- that way 2 times
-hope this helps :)
Let n = the hours elapsed when the two trains are 660 miles apart.
Let the first train travel east and the second train travel west.
The distance traveled by the first train is
x = (50 mi/h)*(n h) = 50n mi
The distance traveled by the second train is
y = (60 mi/h)*(n h) = 60n h
The distance between the two trains after n hours is
x + y = 50 n + 60n = 110n mi
Because this distance is 660 miles, therefore
110n = 660
n = 6 hours
Answer: 6 hours
I hope this helps. Sorry it took so long
7^-3 = 1 /(7^3) = 1 / 343
hope it helps