Question

Pls answer the question below

Answer 1

Answer:

80+72= 152

3240+755+152=4147

False

True

Answer 2

Step-by-step explanation:

7)

1+2+3+...+80 = 3240

71+72+...+80 = 755

= 1+2+3+...+70

= (1+2+3+...+80)-(71+72+...+80)

= 3240 - 755

= 2485

OR

1+2+3+....+70 = 70*71/2 = 35*71 = 2485.

8)

T, F