Answer:
1. Step by step explanation:- Since 120$ is obtained by reducing the price by 30% that is subtracting ORIGINAL COST from its 30%.
In order to obtain the Cost Price we shall add back the 30% to 120$ to obtain the Cost Price -
120+30%*120 = 120+36= 156 $ . (Ignore the currency. Answer remains unaffected )
2. Question is incomplete.
3. 48=2*2*2*2*3
4. Factorization of x^2-2x-35 is
=x^2-7x+5x-35 (-7x+5x= -2x)
=x(x-7)-5(x-7) (Taking x common from the first () and 5 from the second bracket)
=(x-5)(x-7)
Factors are 7 and 5.
5. 2.1*10^8
6. For this question it is to be assumed that -
2x+7=-1
Now normally solving the equation we get
2x=-1-7
=> 2x= -8
=> x= -4
7. Multiples of 270 = 3*3*3*2*5
Multiples of 84 = 2*2*3*7
Common multiples = 2*3=6
8. First 5 terms can be obtained by putting (1,2,3,4,5) serially in the equation 8n+2
8*1+2=10, 8*2+2= 18, 8*3+2=26 , 8*4+2=34, 8*5+2= 42