Answer:
Step-by-step explanation:
Be careful how you handle this.
f(-7) = 3(-7)^2
f(-7) = 3* 49 Notice the minus sign disappears. That's because there are 2 of them.
f(-7) = 147
Answer:
b = 9
Step-by-step explanation:
Using Pythagoras' identity in the right triangle.
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is
b² + 12² = 15²
b² + 144 = 225 ( subtract 144 from both sides )
b² = 81 ( take the square root of both sides )
b =
= 9
Answer:
168cm is the right answer
Step-by-step explanation:
Answer: 36.2
Step-by-step explanation:
Diameter = 8 cm
radius = diameter/2 = 4 cm
A = pi * r^2
A = pi * (4 cm)^2
A = 16pi cm^2