Answer:
first one:
Area of a circle = π*r²
diameter (they gave) = 30ft
radius = diameter/2 = 15ft
π*15²= 706.85834705770347865409476123789
to nearest tenth= 706.9 ft
second question:
circumference = 2*π*r or d(diameter)*π
diameter = 30ft
30*π = circumference = 94.247779607693797153879301498385
in terms of π = 30π
2. 3. 5. are correct
1. and 4. are actually interchanged
Answer:
• for x = 2a√t, make t the subject:

• then find y:

Where’s the rest of the question? Cant answer unless I can see if she’s correct or not.