B.
Elements of the same group in the Periodic Table will have similar chemical and physical properties.
This is false because 20-8 is 12 and 12 times 5 isnt 17
Should be four times to get in between 9 and 10
This is the concept of trigonometry, the distance from the foot of the ladder will be given by:
tan theta=[opposite]/[adjacent]
opposite=17 ft
adjacent=x ft
theta=37°
thus
tan 37=17/x
x=17/tan 37
x=22.56 ft
=22.6 ft (to the nearest 10th of a foot)
