1. (a) The table gives the melting points of some of the elements of Group 7.
Element
Atomic number
Melting point in °C
9
-220
Fluorine
Chlorine
17
-101
35
-7
Bromine
lodine
53
114
Astatine
85
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Are carpet coast $15 per square metre. the total delivery charge is $21 peter buys n squared metres of carpet what is the expression which represents the total cost in $

The surface area of the triangular prism is .

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.