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sergij07 [2.7K]
3 years ago
9

−64 = −0.8k k = ? Please help me!!!

Mathematics
2 answers:
galben [10]3 years ago
3 0

Answer:

Step-by-step explanation:

-64 = - 0.8k

k = -64 / -0.8

therefore k = 80

Hope it will help :)

Papessa [141]3 years ago
3 0

Answer:

k = 80

Step-by-step explanation:

- 64 =  - 0.8k

We can convert the decimal from - 0.8 into - 8/10.

- 0.8 = -   \frac{8}{10}

Rewrite the equation.

- 64 =  -  \frac{8}{10} k

Move 10 to multiply - 64

- 64 \times 10 =  - 8k \\  - 640 =  - 8k

Then we move - 8 to divide - 640.

\frac{ - 640}{ - 8}  = k \\ 80 = k

Dividing both negative equal positive. Therefore, the value of k is 80.

<u>Answer</u><u> </u><u>Check</u>

Substitute k = 80 in the equation.

- 64 =  - 0.8 \times 80 \\  - 64 =  -  \frac{8}{10}  \times 80 \\  - 64 =  - 8  \times 8 \\  - 64 =  - 64

The equation is true. Therefore, 80 is the right answer.

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