Question

find 10th term of AP -40,-15,10 ​

Answer 1

Answer:

ap=-45

Step-by-step explanation:

bro/sis if u understand pls mark me as brainliest

Answer 2

Given :-

• AP :- -40 , -15 , 10

To Find :-

• The 10th term of AP.

Solution :-

Given that,

↪AP = -40 , -15 , 10

↪Here, a = -40 , $\tt{d = t_{2} - t_{1}}$

↪ d = -15 - (-40)

↪ d = -15 + 40

↪ d = 25

As we know that,

${\boxed{\tt{\red{t_{n} = a + (n - 1)d}}}}$

↪$\tt{t_{10} = -40 + (10 - 1) × 25}$

↪$\tt{t_{10} = -40 + 9 × 25}$

↪$\tt{t_{10} = -40 + 225}$

↪$\tt\blue{t_{10} = 185}$

Hence,

• The 10th term of AP is 185.

____________________

Some Formulae related to AP.

• $\tt{S_{n} = \frac{n}{2}[2a + (n - 1)d]}$

• $\tt{S_{n} = \frac{n}{2}[t_1 + t_n ]}$