please solve these 7 questions for 50 points i mark it as brainlest and no wrong answer i report class -10
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20.
A.P=25+28+...........+100
a=25
d=3
l=100
l=a+(n-1)d
100=25+(n- 1)3
100-25=(n-1)3
75/3=n-1
25=n-1
n=26
sum=
n/2[2a+(n-1)d]
26/2[2(25)+(25)3
13(50+75)
13*125
1625
16no.
x+y=137......... equation 2
x-y=43......... equation 1
by substituting equation 1and 2
y-y=0
x+x=137+43
2x=180
x=90
by putting the value of X in equation 1
x+y=137
y=137-90
=45
x=90,y=45
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X - 90
y - 45
hope its usefull
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