For sake of convenience, reverse the series, then it would be:
21,19,17.....7
a=21, d = -2,
s(4) = 4/2 (21+15)
s(4)=2(36)
s(4) = 72
Answer:
infinite solution
Step-by-step explanation:
because it is a linear equation.
2x-x-7=0
3x-7=0
add 7 to 7 and 0, so then we cross out 7-7, and then
3x=7, bc u change the subtraction to addition, sr if thst doesn't make sense but 3x=7 is the answer
Answer:
-5a-15/4
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6
Step-by-step explanation:
Answer:
y=-3x+3/2
Step-by-step explanation:
move 6x to the other side
2y=-6x+3
then divide y
y=-3x+3/2
