Question Answers

177. Find x (3) 2^x + 2^x + 2^x = 192 177. Find x (3) 2^x + 2^x + 2^x = 192 August 1, 2021 Category: Chapter 12 - Exponents and Powers , Maths , NCERT Class 8 ,

177. Find x (2) (2/5)^2x + 6 x (2/5)^3 = (2/5)^x + 2 177. Find x (2) (2/5)^2x + 6 x (2/5)^3 = (2/5)^x + 2 August 1, 2021 Category: Chapter 12 - Exponents and Powers , Maths , NCERT Class 8 ,

177. Find x (1) (-1/7)^-5 ÷ (-1/7)^-7 = (-7)^x 177. Find x (1) (-1/7)^-5 ÷ (-1/7)^-7 = (-7)^x August 1, 2021 Category: Chapter 12 - Exponents and Powers , Maths , NCERT Class 8 ,

175. By what number should (–15)^–1 be divided so that the quotient may be equal to (–5)^–1? 175. By what number should (–15)^–1 be divided so that the quotient may be equal to (–5)^–1? August 1, 2021 Category: Chapter 12 - Exponents and Powers , Maths , NCERT Class 8 ,

174. A particular star is at a distance of about 8.1 × 10^13 km from the Earth. Assuring that light travels at 3 × 10^8 m per second, find how long does light takes from that star to reach the Earth. 174. A particular star is at a distance of about 8.1 × 10^13 km [...]

172. Mass of Mars is 6.42 × 10^29 kg and mass of the Sun is 1.99 × 10^30 kg. What is the total mass? 172. Mass of Mars is 6.42 × 10^29 kg and mass of the Sun is 1.99 × 10^30 kg. What is the total mass? August 1, 2021 Category: Chapter 12 - [...]

167. Find three machines that can be replaced with hook-ups of (× 5) machines 167. Find three machines that can be replaced with hook-ups of (× 5) machines August 1, 2021 Category: Chapter 12 - Exponents and Powers , Maths , NCERT Class 8 ,

166, Find a repeater machine that will do the same work as a (×1/8 ) machine. 166 Find a repeater machine that will do the same work as a (×1/8 ) machine. August 1, 2021 Category: Chapter 12 - Exponents and Powers , Maths , NCERT Class 8 ,

165. Find two repeater machines that will do the same work as a (× 81) machine. 165. Find two repeater machines that will do the same work as a (× 81) machine. August 1, 2021 Category: Chapter 12 - Exponents and Powers , Maths , NCERT Class 8 ,

164. If possible, find a hook-up of prime base number machine that will do the same work as the given stretching machine. Do not use (× 1) machines. 164. If possible find a hook-up of prime base number machine that will do the same work as the given stretching machine. Do not use (× 1) [...]