We have the formula tan( a- b ) = ( tan a - tan b ) / ( 1 + tan a· tan b );
We use the formula (sin x)^2 + (cos x)^2 = 1;
Because sin a = 4/5 we have cos a = 3/5; then tan a = sin a / cos a = 4 / 3;
Because sin b = 5 / 13 we have cos b = 12 / 13; then tan b = sin b / cos b = 5 /12;
Finally, tan ( a - b ) = ( 4 / 3 - 5 / 12 ) / ( 1 + (4 / 3)·( 5 / 12 ) ) = ( 9 / 12 ) / ( 1 + 5 / 9 ) = ( 3 / 4 ) / ( 14 / 9 ) = ( 3 / 4 )·( 9 / 14 ) = 27 / 56.
I would split 64 into 60 & 4, and 43 into 40 & 3
Than i would add the 60 and 40 together (which will give me 100)
I will than add 4 & 3 together (which will give me 7)
Than i will add 100 and 7 together, which will give me 107
107 is your final answer
hope this helps
3x≤-6
x=-2
mark it on the x axis and then shade to the left