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Luden [163]
3 years ago
8

NEED THIS ASAP Simplify 3^2 ⋅ 3^5. A) 3^7 B)3^10 C)9^7 D)9^10

Mathematics
1 answer:
Free_Kalibri [48]3 years ago
8 0

Use\ a^n\cdot a^m=a^{n+m}\\\\3^2\cdot3^5=3^{2+5}=3^7\to\boxed{A)}

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1/3(-15 divide 1/2) 1/4 what does it equal
Dafna1 [17]

Answer:

-2.5 or - 2 1/2

Step-by-step explanation:

Writing out the expression Mathematically ;

1/3(-15÷1/2)1/4

Using PEMDAS :

Solving the bracket first

(-15 ÷ 1/2) = (-15 * 2/1) = - 30

We have :

1/3(-30)1/4 = - 10 * 1/4 = - 10 / 4 = - 2.5

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3 0
2 years ago
A submarine cruises underwater at 20 km/h and on
Darina [25.2K]

Answer:

System of equations:

20x + 30y = 650

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Step-by-step explanation:

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Let y = time on the surface at 30 km/h.

speed = distance/time

distance = speed * time

distance underwater: 20x

distance on the surface: 30y

total distance: 650

20x + 30y = 650

total time: x + y

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x + y = 25

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x + y = 25

20x + 30y = 650

-20x - 20y = -500

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x + 15 = 25

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