3 years ago

I need to know the answer for 19,20,21

1 answer:

7 0

19. $30,681.82
20. Find surface area for this one
21. Use geometry

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Dima020 [189]

Answer:

50%

Step-by-step explanation:

3 0

3 years ago

iren2701 [21]

Answer:

$\huge\boxed{(3^4)^4=3^8\cdot3^8}\\\boxed{4^3\cdot5^3=20^3}\\\boxed{(4^3)^3=4^3\cdot4^3\cdo4^3}$

Step-by-step explanation:

$a^n\cdot a^n=a^{n+m}\\\\(a^n)^m=a^{n\cdot m}\\\\(a\cdot b)^n=a^n\cdot b^n\\=====================$

$(4^3)^3=4^{3\cdot3}=4^9\\4^3\cdot4^3=4^{3+3}=4^6\\\\4^9\neq4^6\to(4^3)^3\neq4^3\cdot4^3\\==================$

$(3^4)^4=3^{4\cdot4}=3^{16}\\3^8\cdot3^8=3^{8+8}=3^{16}\\\\(3^4)^4=3^8\cdot3^8\\================$

$6^4\cdot3^4=(6\cdot3)^4=18^4\\\\18^4\neq18^8\to6^4\cdot3^4\neq18^8\\=================$

$4^3\cdot5^3=(4\cdot5)^3=20^3\\\\4^3\cdot5^3=20^3\\=================$

$(4^3)^3=4^{3\cdot3}=4^9\\4^3\cdot4^3\cdot4^3=4^{3+3+3}=4^9\\\\(4^3)^3=4^3\cdot4^3\cdot4^3$

3 0

3 years ago

satela [25.4K]

You would do parentheses first and that answer you will x 7

6 0

3 years ago

AnnZ [28]

685-85=600
1 year =12 months
12 multiply by 2 =24
600 divided by 24=25
answer=25

8 0

3 years ago

Zigmanuir [339]

Answer:

2×8-4^2

=16-16

0 is the porduct

7 0

3 years ago