exam Maths Puzzle Numerical Ability

PLease help me solve these 4 linear equations

x-4<-6

x+12<-5x

2x+3>x-1

7-5x<22

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exam Other Question

Find the number of terms and the sum of the series 7+17+27+...+107 Given f(x)=3^x, which statement is true?
a) f(x+y)=f(x)+(y)
b) f(x+y)=f(x)f(y)
c) f(xy)=f(x)+f(y)
d) f(x/y)=f(x-y)