Question

Call any five of your friends or relatives
Ask them one by one to take deep breath and expand his/her chest
As much as possible
Measure the size of chest with measuring tape and record.
Now let him/her breathe out and measure his/her chest with same
measuring Tape and record your observation
The difference in the two readings of the measuring tape will give the maximum
Expansion in the size of the chest. Observation Table :
NAME OF
CHEST
CHEST
CHEST
FRIEND/RELATIVE MEASUREMENT MEASUREMENT EXPANSION
WHILE
WHILE
(X-Y)
BREATHING BREATHING
IN(X)
OUTY
Cm
Cm
Cm
Cm
Cm
Cm
Cm
Cm
Cml
Cm
Cm
Cm
Cm
Cm
Also research about the following and write in your Science Project File.
Cm
Shalation?​

Answer 1

Answer:

Solution−

i) (-25) × [(-7)]+(-15)]

= (-25) × (-22)

= 550

= [(-25)×(-7)] + [(-25)×(-15)]

= 175 + 375

= 550

ii) (-7) × [(-8)+9]

= (-7) × 1

= -7

= [-7×(-8)] + [(-7)×9]

= 56 + (-63)

= -7