#learn mathematics;1+5=37,2+7=83,3+9=147Then 5+1=?Can you solve this?;#puzzle#Reasoning

The points (3,7),(6,5) and (15,-1) are the vertices of an equlateral triangle

Solve the following : 9(5)/7-2(2)/7-1

Solve : 2/3 times 5/7 + 1/4 times 3/7 - 7/3 times 1/4 = ?

Solve : 2/3 times 5/7 + 1/4 times 3/7 - 7/3 times 1/4 = ?

If xepsilon {1,2,3,4,5,6,7,8,9,10}, solve the inequation 2x+6le5x-4 .

The mean of 1^3. 2^3,3^3,4^3,5^3,6^3,7^3 is

Which of the following relations are functions from A to B write their domain and range if it is not a function give reason ? f:A rarr B is defined by f={(1,-2),(3,7),(5,6),(9,0)},A={1,3,5,9},B={-2,7,-6,0,1,2}

If A = {1,4,7, 8}, B = {4, 6, 8, 9} and C = {3,4,5,7} , then A cap ( B - C ) is