;366665?(?334566 thojdegoic
12 x 80 = 960
18 x 86 = 1548
960 + 1548 = 2508
12 + 18 = 30
2508/30 = 83.6
The class average is 83.6
Answer:
x = 35°
Step-by-step explanation:
sin x = cos (90° - x)
sin 55° = cos (90° - 55°)
sin 55° = cos 35°
x = 35°
Answer:
2
Step-by-step explanation:
As she bought 4 times as many tiggerfish (y) as parrotfish (x) you need an equation that shows this relation:
y=4x.
So you can eliminate option 1.
Then you know that she bought, in total, 280 tropical fish. This means that all the tiggerfish and parrotfish together must sum 280:
x + y = 280.
The only option, between the remaining, with this equation is option 2.
So, option 2 is the correct.