Asecurity alarm requires a four-digit code. the code can use the digits 0–9 and the digits cannot be repeated.

what is the approximate probability that the code only contains odd numbers?

a)0.0005
b)0.00099
c)0.012
d)0.02381

Solve the problem by making up an equation. a child is 12 years old, and his father is 32 years older. in how many years will the age of the father be 3 times the age of the child?

Solve 2x+y=3 x+y=5 in substitution method

The frequency table shows a set of data collected by a doctor for adult patients who were diagnosed with a strain of influenza. patients with influenza age range number of sick patients 25 to 29 30 to 34 35 to 39 40 to 45 which dot plot could represent the same data as the frequency table? patients with flu