The ratio between the speeds of the two train is 7:9. If the second train runs 400km in 5hr, then the speed of first train is a) 10 km/hr. b) 50km/hr. c) 71km/hr. d) 80km/hr. Please also show the solving steps

Answer:

When the position of a body with respect to it's surroundings changes with time , the body is said to be in motion.

Explanation:

the state of being by which the the thing changes its position with respect to time :the thing is said to be in motion

Explanation:

Valency of Sodium

The electronic configuration of sodium can be written as 2, 8, 1. 2, 8, 1 electrons are distributed in the shells K, L, M respectively. Therefore, valence electron in sodium is 1 and it needs to lose 1 electron from the outermost orbit to attain octet. Hence, the valency of sodium is 1.

Answer: all metals have positive valency....it is because they lose electrons  which results them to have positive valency

Explanation:

Answer:

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Step-by-step explanation:

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Find the product, using suitable properties:

(a) 26 × (– 48) + (– 48) × (–36)

(b) 8 × 53 × (–125)

(c) 15 × (–25) × (– 4) × (–10)

(d) (– 41) × 102

(e) 625 × (–35) + (– 625) × 65

(f) 7 × (50 – 2)

(g) (–17) × (–29)

(h) (–57) × (–19) + 57

Solution:

a) 26 × (-48) + (-48) × (-36)

Using distributive property, we get

(a × b) + (b × c) = b × (a + c)

= (-48) × [26 + (-36)]

= (-48) × [26 - 36]

= (-48) × (-10)

= 480

b) 8 × 53 × (-125)

Using associative property, we get

(a × b) × c = a × (b × c)

= 8 × (53 × -(125))

= 8 × -6625

= -53000

c) 15 × (-25) × ( -4) × (-10)

Using associative property, we get

= 15 × [(-25) × (-4) × (-10)]

= 15 × [(100) × (-10)]

= 15 × (-1000)

= -15000

d) (-41) × 102

Using distributive law, we get

= (-41) × (100 + 2)......[a × (b + c)] = (a × b + a × c)

= (-41) × 100 + (-41) × 2

= -4100 - 82

= -4182

Answer:

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