YOU ARE NOT DUMB THIS CAN ACTUALLY BE TOUGH SO DO NOT EVER SAY YOU ARE DUMB.
71. You need to find two numbers that when multiplied would equal to 800 something. (I used a calculator so it was easier for me)
I found that 98 times 9 would equal to 882. When you look at the problem and plug in the missing numbers to it, you can see that this works.
73. Using the exact same technique as for the 1st problem. You still need two numbers that when multiplied would equal to 480 something
So I found that 61 times 08 is 488. When you look at the missing numbers this is a possible answer.
Then now you need to find a number that is something _, 0_0 added to 488 with the sum of _,53_
So I found that 1,050 plus 488 would equal to 1,538. Again if you look at the missing numbers you can see that this works.
75. I cannot really find any number that would multiply with 49 to get 4_8 so I am so sorry. I will keep trying to find a number that would do the trick but I hope that answering the first two questions really helped you out.
Have a great day and remember that you are not dumb, you simply did not know the answer and that's okay. It always happen. Hope that this helped you hon :)