Cho x1(n)= r(n). rect4(n-1); x2(n)= 2n[u(n)-u(n-3)]. Tính x(n)= x1(n)*x2(n)

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

When rolling 26 sided number cube what are the chances some of the role will be seven