Answer:
C. To find the total of their ages, we need to add C. Ibrahim's age (i) to Tareq's age (t). The sum of their ages can be expressed as: i + t. For example, if C. Ibrahim is 10 years old (i = 10) and Tareq is 7 years old (t = 7), the total of their ages would be 10 + 7 = 17 years. So, in general, the total of their ages would be i + t years.
D. To find out how many video clips Aya can store on two memory cards, we need to know the capacity of each memory card. Let's assume that Aya can store "x" video clips on one memory card. Since Aya can store "x" video clips on one memory card, he can store "x" video clips on each of the two memory cards. To calculate the total number of video clips Aya can store on two memory cards, we need to add the number of video clips on each memory card together. So, the total number of video clips Aya can store on two memory cards would be 2 times "x". Therefore, Aya can store 2x video clips on two memory cards.