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andriy [413]
3 years ago
7

Can u solve these for me I need help show work pls

Mathematics
2 answers:
e-lub [12.9K]3 years ago
8 0

Answer:

see explanation

Step-by-step explanation:

(6)

multiply each term inside the parenthesis by the fraction outside

= (\frac{1}{2} × k ) + (\frac{1}{2} × - 4)

= \frac{1}{2} k + (- 2) = \frac{1}{2} k - 2

(7)

A reminder that the absolute value function always returns a positive value.

The value inside the bars can be positive or negative but the result is always positive.

2 + |- 5 + 4 | = 2 + |- 1 | = 2 + 1 = 3

(8)

A |- 4 - 5 | = | - 9 | = 9

B - | 9 | = - 9 ← does not equal 9

C | - 9 | = 9

D | 9 | = 9

(9)

given 3(2n + 1) + 4(n - 2)

distribute both parenthesis and collect like terms

= 6n + 3 + 4n - 8

= (6n + 4n) + (3 - 8)

= 10n + (- 5) = 10n - 5


vlabodo [156]3 years ago
4 0

Answer:


Step-by-step explanation:

answer

6.   1/2k-2  


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Step-by-step explanation:

The question is "In two minutes a current of 5 amps develops 1,200 heat units in a wire of 8 ohms resistance. What resistance does a similar wire have, which develops 6,000 heat units with a current of 10 amps in 5 minutes?"

Current, I₁ = 5 A

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So, the new resistance is 4 ohms.

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