2a^3 (5a^2– 7a)+(3a^4 – a^5 )

9a^5-11a^4

Step-by-step explanation:

2a^3 (5a^2– 7a)+(3a^4 – a^5 )

10a^5-14a^4+3a^4-a^5

9a^5-11a^4

1. 16.64

a^2+b^2=c^2

pr^2=pq^2+qr^2

pr^2=14^2+ 9^2

pr^2=196+81

pr= sqr root of 277

16.64

2. 11.31

c^2-a^2=b^2

18^2- 14^2=b^2

b^2=324-196

b=sqr root of 126

b=11.31

hope it ! (btw im in connections academy to, good luck! )