Question

write all the answer

Answer 1

Answer:

could answer only  15th and 16th

Step-by-step explanation:

15) (0.7)²-(0.3)²

solution: now, as we know (a²-b²)=(a+b)(a-b).

              the question is in the form of (a²-b²).

              =(0.7+0.3)(0.7-0.3)

              =(1)(0.4)

so the final answer is 0.4.  

16) (4.5)²-(1.5)²

solution: (a²-b²)=(a+b)(a-b)

             =(4.5+1.5)(4.5-1.5)

             =(6)(3)

so the final answer is 18.          

Answer 2

Hi Mate !!!

sorry mate i couldn't answer all but i have answered only  15th and 16th

Step-by-step explanation:

15) (0.7)²-(0.3)²

solution: now, as we know (a²-b²)=(a+b)(a-b).

              the question is in the form of (a²-b²).

              =(0.7+0.3)(0.7-0.3)

              =(1)(0.4)

so the final answer is 0.4.  

16) (4.5)²-(1.5)²

solution: (a²-b²)=(a+b)(a-b)

             =(4.5+1.5)(4.5-1.5)

             =(6)(3)

so the final answer is18.          

THANKS DUDE