Find the 4th term of (x+5)^7

a. 35x^4

b. 4375x^4

c. 21,875x^3

d. 625x^4

B. 4375x^4

Step-by-step explanation:

Firstly, you can just multiply it and look at the fourth term or use the binomial theorem. Either way it's B.

4375x^4.

Step-by-step explanation:

There is a useful formula for answering these type of questions. It is:

(r + 1)th term of (x + a)^n = nCr x^(n-r) a^r.

4th term = (3 + 1)th term of (x + 5)^7

=  7C3 x^(7-3) 5^3

= 35 x^4 * 125

= 4375x^4.

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐

hello i might . what do you need.

friend me