6 x 89 is 534
6 x (90 - 1) is 534. BUT you have to subtract 90 from 1 and that's 89. So then you multiply 6 by 89.
6 x 90 is 540 and 6 x 1 is 6. you take 540 subtract 6 and that's 534.
540 - 6 is 534.

8 0

4 years ago

The length of & rectangle is 3 times the

vagabundo [1.1K]

Answer:

The answer for this question is C, E and F .

Step-by-step explanation:

Given that the length is 3 times the width. So firstly, you have to find the expression of length :

$length = 3 \times width$

Let width = w,

$length = 3 \times w$

$length = 3w$

Next, the perimeter of rectangle is P = 2(length+width) so you have to substitute the expression into the formula :

$p = 2(length + width)$

Let length = 3w,

Let width = w,

$p = 2(3w + w) \: \: (option \: e)$

$p = 2(3w) + 2(w) \: \: (option \: f)$

$p = 6w + 2w$

$p = 8w \: \: (option \: c)$

6 0

3 years ago