What does deficient in math terms mean?

What is the symbol for million? Can we perform Addition of 1 to n numbers? If you are 76 what year were you born? A class of 25 students has 10 boys Three boys have braces And 4 girls have braces What is the ratio? The are 486 balloons that need to be blown up if there are 18 volunteers how many balloons would each volunteer need to blow up? How do you calculate the surface area of a plant? Who are the female models in the current l l bean catalog? What is the square root of six divided by the square root of two in simplest radical form? How do you put improper fraction as a mixed number in simplest form? What is the reference angle of 10 degrees? Why is the impact of humans greater today than that at anytime in the past? What is happening year after year called? How do you find the area of a semi circle or quarter circle when pi is twenty two sevenths and please include an example for both semi circle AND quarter circle? Can you have twins if your husband's mother is a twin? WHAT IS The product of a number and 4 less than the numbers is -3? What is the possible value if perimeter of a triangle is 42 cm and it's largest side is a fundamental number? C plus -2 equals 21? When a 5 pound weight is lifted 10 feet of work is done.? Who is one kind of person who loves plane geometry? Surface area formula of a prism?