Question

5. Find the product, using suitable properties:

(a) 26 X (-48) + (-48) X (-36)

(b) 8 x 53 x (-125)

(c) 15 X (-25) × (-4) X (-10)

(d) (-41) 102

(e) 625 (-35) + (- 625) x 65

(f) 7 x (50 - 2)

(g) (-17) (-29)

(h) (-57) X (-19) + 57


6. A certain freezing process requires that room temperature be lowered from 40°C at the rate of 5°C every hour. What will be the room temperature 10 hours after the
process begins?


7. In a class test containing 10 questions, 5 marks are awarded for every correct answer and (-2) marks are awarded for every incorrect answer and 0 for questions not attempted.

(1) Mohan gets four correct and six incorrect answers. What is his score?

(ii) Reshma gets five correct answers and five incorrect answers, what is her score?

(iii) Heena gets two correct and five incorrect answers out of seven questions she attempts. What is her score?


8. A cement company earns a profit of rupees 8 per bag of white cement sold and a loss of rupees 5 per bag of grey cement sold.

(a) The company sells 3,000 bags of white cement and 5,000 bags of grey cement in a month. What is it's profit or loss?

(b) What is the number of white cement bags it must sell to have neither profit nor loss, if the number of grey bags sold is 6,400 bags.


9. Replace the blank with an integer to make it a true statement.

(a) (-3) × ____ = 27

(b) 5 × ____ = -35

(c) ____ × (-8) = -56

(d) ____ × (-12) = 132



PLEASE GIVE STEP BY STEP EXPLANATION
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Answer 1

Step-by-step explanation:

1) distributive property...............