Jason plays the tuba 30 minutes a day. Which expression shows how many minutes Jason practiced in d days? A. 30 + d
B. 30 – d
C. 30 ÷ d
D. 30d

The answer is D

Step-by-step explanation:

30d = 30×d

Step-by-step explanation:

option d is correct .

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

24

step-by-step explanation:

if it takes 8 pounds to make 12 divide 12 by 8 and you get 1.5, 1.5 x 16 = 24