Answer:
490
Step-by-step explanation:
because the 7 (last digit) is not less than 5, it rounds up to 490
Answer:

and

.
Step-by-step explanation:
The given ellipse has the equation:

This can be rewritten as

We compare this to the general equation of the ellipse:

We have

and

The vertices of this ellipse are at

and

.
Therefore the vertices of this ellipse are at

and

.
The correct choice is A.
Answer: 6+4x=26, 4x=20
Step-by-step explanation: 6+4x=20 is the initial equation but completely multiplied by two, so you can know without solving that it is equivalent.
If you solve the equation, 2x+3=13 (subtract 3 from both sides)
2x=10 (divide both sides by 2)
x equals 5.
if you plug in 5 as x to 4x=20, you get 20=20, which is a true statement, so this choice is also correct. You could also solve to prove x equals 5 in this equation as well. Divide 20 by 4 and you get x=5.
Answer:
423.9
Step-by-step explanation:
Area 1 = 3.14 (16²) = 803.84
Area 2 = 3.14 (11²) = 379.94
803.84 - 379.94 = 423.9
Answer:
if it is a multiple choice question
the answer is 1.47 mol H2
Step-by-step explanation: