Number 4: line XZ; number 5: theory of congruent triangles.
Answer:
the answer is 15 subtract the highest number from the lowest
I’m pretty sure the 2nd one is the associate property and the 3rd one is the additive inverse property
Hope this helps :)
Answer:
14 hours
Step-by-step explanation:
Let's call the task 3x
The older bro does twice as younger so it would be 2x long and younger brother work x long
Since the totsl of work is 3x = 21 x woul be 21÷3 = 7
the older brother must work 2 × 7 = 14 hours long
I think the answer is 6 and 5 because 6+5=11 and 6-5=1
