Help pls I'm confused

Sorry this took so long, hope this helps

also the "a^2" is meant to mean this " "

Step-by-step explanation:

1) a^2+b^2=c^2

4^2+3^2=c^2

16+9=c^2

25=c^2

=c

5=c

2) a^2+b^2=c^2

15^2+8^2=c^2

225+64=c^2

289=c^2

=c

15=c

3)a^2+b^2=c^2

10^2+50^2=c^2

100+2500=c^2

2600=c^2

=c

50.99≈c

4) a=

a=

a=

a=

a=9

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step-by-step explanation: