Question

Q7. The temperature of a city is 4°C. Next day the temperature falls by 5°C. What
is the temperature of the city next day?
Q8. A diver descends 20 feet in the water from the boat at the surface of a lake.
He then rose 12 feet and descends another 18 feet. At this point what is his
depth in water?
Q9. Verify a-(-b) = a + b for the following values of 'a' and 'b'
a. a = 34
b = 73
b. a = 45
b = 30​

Answer 1

Step-by-step explanation:

9. a-(-b)=a+b

•when a= 34, b=73

34-(-73)= 34+73

34+73 = 34+73

107 = 107

.

• a= 45; b=30

45-(-30) = 45+30

45+30 = 45+30

75 = 75