Let U = { x∈ N : x ≤ 8}, A = { x∈ N : 5< x2 < 50} and B = { x ∈ N : x is a prime number less than 10 }. Verify that.

(i)(A ∪ B)′ = A′ ∩ B'

(ii) (A ∩ B)′ = A′ ∪ B′

45

step-by-step explanation:

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.