Mathematics
Write an algebraic expression for each of the following:
(i) If 1 metre cloth costs ₹ x, then what is cost of 6 metre cloth?
(ii) If the cost of a notebook is ₹ x and the cost of a book is ₹ y, then what is the cost of 5 notebooks and 2 books?
(iii) The score of Ragini in Mathematics is 23 more than two-third of her score in English. If she scores x marks in English, what is her score in Mathematics?
(iv) If the length of a side of a regular pentagon is x cm, then what is the perimeter of the pentagon?
Related Questions
Look at the following matchstick pattern of polygons. Complete the table. Also write the general rule that gives the number of matchsticks.
Number of polygons 1 2 3 4 5 … n Number of matchsticks … … … … … … … When x = 4 and y = 2, find the value of:
(i) x + y
(ii) x - y
(iii) x2 + 2
(iv) x2 - 2xy + y2
When a = 3, b = 0 and c = 4, find the value of:
(i) ab + 2bc + 3ca + 4abc
(ii) a3 + b3 + c3 - 3abc