Please Help ASAP need for son

The first one: 26, 51, 103

Step-by-step explanation:

The angle sum of a triangle will equal 180 degrees. You can check this by adding up all of the angles.

If you were to add up the angles in the other choices, the angle sum would be higher or lower than 180 degrees.

.mp4 files, because, video

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!