The answer is 29.5. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
17a + 21a + 45 = 38a+ 45
21 + 39 + 45 + 25 = 130
The answer is 20+25=45
Yes,45+25 IS 70
25 + 45 = 70
Answer is 70.
If you mean 125+23+45 then it is 193
45
The sum of these numbers is 563.
25/45 + 6/45 = 31/45
The answer is 218. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
33 + 45 + 7 = 85. You seem to be unaware of the fact that you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer.