Question

5. Harnam purchased a book for (7x - 9) and a pen for (x + 16). How much did he spend in
buying these two items?
6. Find the perimeter of a rectangle whose length is (3x + 9) cm and width is (4x - 1) cm.​

Answer 1

Answer:

5.(8x+7) Rs.

6.14x+16 cm

Step-by-step explanation:

5. >Price of book= (7x-9) Rs.

>Price of pen= (x+16) Rs.

>Total price= (7x-9)+(x+16)

                   = 7x+x-9+16

                   = 8x+7

6. >Perimeter of a rectangle= 2(l+b)

> Length of a rectangle = (3x+9) cm

>Breadth of a rectangle = (4x-1) cm

.'. Perimter of the rectangle = 2(l+b)

                                              = 2{(3x+9) + (4x-1)}

                                              = 2{3x+4x+9-1}

                                              = 2(7x+8)

                                              = (2)(7x) + (2)(8)

                                              = 14x + 16 cm is the perimeter of the rectangle