Question

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Answer 1

Answer:

a)-3^7=2187

b)-1/625=-(1/5)^4

c)-2/7

d)90

Step-by-step explanation:

d)Boys =Total students - Number of girl students

Boys =150- (2/5×150)

= 150-(2×30)

= 150-60

=90

c)( 3/21 +-3/14) - x =-5/42

[ (42-63)/42 ] -x =-5/42. taken LCM

-1/2 -x = -5/42

x =5/42+1/2 bring x to left hand side to make it positive

x= -16/42 taken LCM

x=-8/21