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MATH Junior High School

Answer :
17||

Look the Pict !
Perimeter = 36
a + a + 10 = 36
2a + 10 = 36
2a = 26
a = 13

19||

Area = 140
Length . width = 140
5x . 7x = 140
35x² = 140
x² = 4
x = 2

The Perimeter is...
= 2(Length + width)
= 2(5.2 + 7.2)
= 2(10 + 14)
= 2(24)
= 48 m