Question

MATHS
Find the measure of each interior angle of a regular.
a. Pentagon Hexagon c Octagon d. polygon of 12 sides
2) The sum of two digit of two digit number is 12. If the new number formed by reversing
the digits as greater than the original number by 54 find the original number
3) Sale (4-30 +2mm
| Simplifi: 144 x 169 (m) 15.21 x 16,97
5
Factorise the following expressions
(i) 16z+20z³
(ii) 4a²+4ab-4ac.​

Answer 1

Answer: -60

Step-by-step explanation: let the digit at ten's place be a and at one's place be b.

Original no.=10a+b

On reversing the digits,

New no.=10b+a

According to question,

New no.+54=Original no.

10b+a+54=10a+b

54=10a+b-10b-a

54=9a-9b

54=-9(a+b)

54/-9=a+b

-6=a+b

Original no.= 10a+b

=10(-6)

=-60