Question

2. Find the fourth term from the end in an A.P. -11,-8,-5, ..., 49.
W.
In an A.P. the 10th term is 46, sum of the 5th and th term is 52. Find the AP
W.
The A.P. in which 4th term is -15 and 9th term is - 30. Find the sum of the first 10
numbers.
5.
Two A.P.'s are given 9, 7, 5,... and 24, 21, 18. . . . . If nth term of both the
progressions are equal then find the value of n and nih term.
6. If sum of 3rd and 8h terms of an A.P.is 7 and sum of 7 and 14" terms is -3 then
find the 10th term.
7. In an A.P. the first term is - and last term is 45. If sum of all numbers in the AP
is 120, then how many terms are there? What is the common difference?
8.
Sum of 1 to n natural numbers is 36, then find the value of n.​

Answer 1

Answer:

$<font color = "red"><B><marquee>Please subscribe Amritanshu Amritanshu YouTube channel and get a chance to chat with me.</marquee>$

$<font color = "red"><B>Answer:$

$<font color = "red"><B>.°.Molarity = 2.79 m$

$<font color = "orange"><B>Explanation:$

$<font color = "green"><B>Q.The density of 3M solution of sodium chloride is 1.25 gram per mole. Calculate the molarity of the solution.$

$<font color = "blue"><B>Solution: Mass of NaCl in 1L solution = 3 × 58.5 = 175.5 grams.$

$<font color = "blue"><B>Mass of 1L solution = 1000 × 1.25 = 1250 grams.$

$<font color = "blue"><B>Mass of water in solution = 1250 - 75.5 = 1074.5 grams.$

$<font color = "blue"><B>Molarity = 3 mol / 1.0745 kg = 2.79 m$

$<font color = "blue"><B>.°.Molarity = 2.79 m$

Answer 2

$0y60y3330343)3343034303y)3 \times \frac{466 {3y663 \sqrt[3]{?} \times \frac{?}{?} }^{?} }{?} \times \frac{?}{?} \times \frac{?}{?}$