Question 594506
If 3x+15 and 2x-10 are complementary then their sum is equal to 90. 3x+15+2x-10=90.then you have 5x+5=90.take the 5 to the right hand side then you have 5x=90-5=85.that is 5x=85.divide both side by 5, x=17.therefore x=17