Bob sold 17 ribbons altogether. Each blue ribbon was 1.7 m long. Each green ribbon was 2.3 m long. The total length of the ribbons that he sold was 31.9 m. How many blue ribbons and green ribbons did he sell?

Alaptop computer is purchased for $1350 . after each year, the resale value decreases by 30% . what will the resale value be after 5 years?

Describe all the numbers that when rounded to the nearest thousand are 645,000

Find the gradient of f(x, y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).