Plz hurry it's !
which is the intersection of the sets p = {1, 2, 3, 4}, q = {4, 5, 6, 7}, and r = {7, 8, 9, 10}?

{7}

null set

{4, 7}

{4}

Step-by-step explanation:

null set

Option B.

Step-by-step explanation:

Intersection of two sets is a set of common terms in both the sets.

Now the two sets are P = {1, 2, 3, 4}, Q = {4, 5, 6, 7} and R = {7, 8, 9, 10}

Common terms in P and Q,

P∩Q = {∅}

Now the common terms in R and (P∩Q).

(P∩Q)∩R = {∅}

Answer is a null set.

Option B, will be the answer.

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step-by-step explanation:

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet