4. Shahad received a AED20 gift card from her teacher. She will be using the card to purchase songs from an online music store. All the songs that she buys are the same price. After she purchased 3 songs the balance on her card is AED16.25. What will be the remaining balance after she buys 5 more songs?

10

Step-by-step explanation:

1.25 each song

she bought 8 songs

1.25 x 8 = 10

10-20 = 10

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step-by-step explanation:

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