Question

plz solve fast I will give brain mark plz plz solve fast with explain ​

Answer 1

a-18,= -3-b
a+b=15
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Answer 2

Answer:

15

Step-by-step explanation:

Here you go:

t1 = a-(n-1)d

t1=a-(1-1)d

t1=a-(0)d

t1=a-d;

2nd equation

t4 = a-(n-1)d

t4=a-(4-1)d

t4=a-(3)d

t4=a-3d;

t2 + t3 is:

t2+t3=a-(2-1)d + a-(3-1)d

=a-d+a-2d

=2a -3d;

It is also equal to this

t1+t4=a-(1-1)d + a-(4-1)d

=a-0+a-3d

=2a -3d;

t1+tr is also equal to 18-3=15

So t2 + t3=a+b=15;

hence found.

Hope this helps.