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Sladkaya [172]
3 years ago
5

Evaluate the following if a = 3,b= -2 and c = 1 a3 - 2bc +5ac

Mathematics
2 answers:
BARSIC [14]3 years ago
7 0

Answer:

28

Step-by-step explanation:

(3)×3 - 2×(-2)×(1) + 5×(3)×(1)

9 - -4 + 15 = 28

valentinak56 [21]3 years ago
4 0

Answer:

46

Step-by-step explanation:

Given

a³ - 2bc + 5ac ← substitute values for a, b, c into the expression

= 3³ - (2 × - 2 × 1) + (5 × 3 × 1)

= 27 - (- 4) + 15

= 27 + 4 + 15

= 46

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Solve: 3n - 6 = -8(6 +5n)<br> and explain how to solve it
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Answer:

Step-by-step explanation:

First use distributive property: a(b + c) = a*b + a*c

3n - 6 = -8(6 + 5n)

3n - 6 = 6 * (-8) + 5n *(-8)

3n - 6 = -48 - 40n

Now add 40n to both sides

3n - 6 + 40n = -48 - 40n + 40n

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Now add 6 to both sides

43n - 6 + 6 = -48 + 6

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Out of 300 animals in the zoo 45 are birds what percent are not birds
Leya [2.2K]

Answer:

85%

Step-by-step explanation:

There are two ways to solve this.

1. You can find the percent of birds, and then subtract that from 100%.

To find the percent of birds, divide 45/300 or make the denominator 100 by dividing both parts by 3.

45/300 (as a fraction)

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That is the same as 15%.

Subtract that from 100% and you get 85%.

2. You find the number of non-bird animals and make that a percent.

300-45=255 non-bird animals

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That is the same as 85%.

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