How many solutions does this system of equations have? A. none
B. exactly one
C. exactly two
D. infinitely many

Ineed to know how to write question one in mathematical terms

Agrasshopper weighs 0.89 grams. express the grasshopper’s weight in scientific notation.

Suppose medical records indicate that the length of newborn babies (in inches) is normally distributed with a mean of 20 and a standard deviation of 2.6. find the probability that a given infant is between 14.8 and 25.2 inches long.