What is the sum of 3,470 and 988?

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

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

What is the value of x in the equation 2(x-4) = 4(2x + 1)?