Answer:
y = x²/4 + x/2 + 21/4 ⇒ -9 ≤ x ≤ 7
Step-by-step explanation:
∵ x = 2t - 1
∴ 2t = x + 1 ⇒ t = (x + 1)/2
∵ y = t² + 5
∴ y = [(x + 1)/2]² + 5 = (x² + 2x + 1)/4 + 5
y = x²/4 + x/2 + 1/4 + 5 = x²/4 + x/2 + 21/4
∵ -4 ≤ t ≤ 4
∴ -9 ≤ x ≤ 7
I'm pretty sure this answer is A or D
If not then I don't know it but I'll try to help you out
1.) a.) 36 b.) 81
2.) a.) 48 b.) 140
(For perimeter you add up all the sides)
(For area you multiply length times width)
<h2>
Answer:</h2>
D. The Earth's surface would be much colder than it is.
<h3>
Step-by-step explanation:</h3>
This is because warm temperatures and high levels of atmospheric carbon dioxide happen at about the same time. So if atmospheric carbon dioxide concentrations double warm up by between 2 and 4.5 degrees Celsius. On the other hand, water vapor promotes, as the greatest contributor, to the Earth’s greenhouse effect. In this way, if carbon dioxide, methane, and water vapor were not in the atmosphere, then it's obvious that the Earth's surface would be much colder than it is.
You can multiply the top equation by 3 and the bottom equation by 2, so you get:
-6y = 42
+6y = 18
(You also multiply whatever is in front but it's cut off so...)
Then you can add the equations so you get:
(whatever numbers cut off are) = 60
Then you solve for the variable cut off and sub it into one of the equations and solve for y.
