After 3 years, the phone value becomes 7600 rupees. The relation between value and years is v = 10000 minus 800t. It represents linear decay because the value decreases by a fixed 800 rupees every year.
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The student already has 500 rupees in her account. Every month, 150 rupees are added. Therefore, after n months, the total amount becomes 500 plus 150n rupees. This expression represents a linear pattern.
The pattern increases by 2 squares at every stage. The next three stages after Stage 4 will have 9, 11 and 13 squares. Therefore, the sequence up to Stage 7 is 1, 3, 5, 7, 9, 11, 13.
Let the shorter piece be x feet. Then the longer piece is 4x feet. Their total length is 300 feet. Solving 5x equals 300 gives x equal to 60. Therefore, the two pieces are 60 feet and 240 feet.
Let Salil’s present age be x years. Then his mother’s age is 3x years. After 5 years, their ages total 70 years. Solving gives x equal to 15. Therefore, their present ages are 15 and 45 years.