Answer: There are 64 relations from A to B.
Step-by-step explanation:
Number of relation from set A to B = 

Since, A={Φ,{Φ},{Φ,{Φ}}} and B={1,2}
i.e. Number of elements in set A = 3
Number of elements in set B = 2
So, Number of relation from set A to B = 

Hence, there are 64 relations from A to B.
Answer: The answer is - 1.
Step-by-step explanation: We are given to find the value of the given expression

We know that 'i' is an imaginary unit and its value is √-1. So, we have

Therefore, the given expression becomes
.
Thus, the answer is - 1.
→1015+9m15=3115
→10+9m15=3115
→15(10+9m)
Answer:
20.25 m²
Step-by-step explanation:
the area (A) and circumference (C) of a circle are calculated using the formulae
C = 2πr and A = πr² ( where r is the radius )
calculate the radius using the formula for circumference
2πr = 9π ( divide both sides by 2π )
r = = = 4.5, hence
A = π × 4.5² = 20.25π m²
Answer:
25.63694268 = r
Step-by-step explanation:
The circumference is
C = 2*pi*r
161 = 2*(3.14) *r
161 = 6.28 r
Divide each side by 6.28
161/6.28 = r
25.63694268 = r