How do you write 300,000,000+40,000,000+7,000,000+30 0,000+10,000+6,000+20+9 in standard form

If square root x = -7, then x= -49 true or false

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

Which point has an coordinates of (2,0) ? a