The answer is A.
If the submarine descended then it went below, and if it ascended it went above. Therefore:
"Descended 2 miles"= -2
"Then descended another 3 miles"= -3
(-2)+(-3)=-5
Adding two negatives together will give you a bigger negative so the submarine would then be 5 miles below its original location.
Total surface area = 2(62.4) + 3(72) = 340.8 cm²
Your friend did this : 2(62.4) + 72 = 196.80.
He did not multiply the 72 by 3 (Since there is 3 sides)
Answer:
Metallic Balloons = 74
Bunches of Helium Balloons = 38
Step-by-step explanation:
The question basically asks for the number of "metallic balloons" sold and the number of bunches of "helium balloons" sold.
We will do it in our way. Let B be number o metallic balloons and H be number of bunches of Helium balloons.
Since Metallics cost 2 each and Heliums cost 3.5 per bunch and totaled sales is 281, we can write and equation as:
2B + 3.5H = 281
and, since they sold 36 MORE metallic than helium ,we can write an equation as:
B - 36 = H
We can put 2nd equation in 1st one and solve for B first:

B = 74
Now, we find H:
H = B - 36
H = 74 - 36 = 38
H = 38
The ordered pairs for A, C and E all work in these inequalities.
In order to find this, you need to test them all and see if they work for both.
Ordered Pair #1: (-1, 10)
2x < y
2(-1) < 10
-2<10 (TRUE)
y > 7
10 > 7 (TRUE)
Ordered Pair #2: (1, 9)
2x < y
2(1) < 9
2 < 9 (TRUE)
y > 7
9 > 7 (TRUE)
Ordered Pair #3: (17, 50)
2x < y
2(17) < 50
34 < 50 (TRUE)
y > 7
50 > 7 (TRUE)