Someone please help me out asap

What is the nth term rule of the linear sequence below? 27 , 25 , 23 , 21 , 19 , . .

How many grams must be adde to 970g to make 1 and a half kg

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a.about 4 b.about 8 c.about 40 d.about 21