Answer:
<u><em>note:</em></u>
<u><em>find the attached solution:</em></u>
The simplest way to do this is to set up equivalent fractions, like this-

=

Solve for x by using cross multiplication.
40*2.2= 88
1*x=88
x=88
Therefore, the boy weighs 88lbs.
Horizontal component = (10N) · sin (20°) = 3.42... N (rounded)
Vertical component = (10N) · cos (20°) = 9.39... N (rounded)
300 miles / 6 hours = 50 miles per hour
It is a very reactive metal with 11 protons ,12 neutrons, 11 electrons, and 1 valence electron