Dwayne is comparing two checking accounts one has a monthly fee of seven dollars and a per check fee of $.30 and the other has a monthly fee of four dollars and a per check fee of $.40 what is The minimum number of checks Dwayne needs to write for the first bank to be a better option

31 checks

Step-by-step explanation:

The equation for the banks are

1: 7+.30x

2: 4+.40x

Once you put 31 as X then the first one is less.

he spend 5.1 minutes chatting with his friends

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5 1/10

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b