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3 years ago

(–2) + (–20) step by step

Mathematics

2 answers:

vazorg [7]3 years ago

7 0

Answer:

-22

Step-by-step explanation:

Step 1: Subtract 20 from -2

(-2) + (-20) is the same thing as -2 - 20
When subtracting a negative value from a negative number, you keep the negative sign and just add the two numbers.
- 2 - 20 = -22

Therefore, the answer is -22.

aalyn [17]3 years ago

6 0

(-2) +(-20) =-22
2+20=22 make result negative

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Step-by-step explanation:

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2 years ago

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3 years ago

If log2 5 = a, log2 3 = b and log2 7 = c, determine an expression for log2 (25/21) in terms of a, b, and c

Ilia_Sergeevich [38]

Answer:

$2a - b -c$

Step-by-step explanation: We know that:

$log_{2} 5 = a\\log_{2} 3 = b\\log_2 7 = c\\$

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$log_2 \frac{25}{21} = log_2 \frac{5^2}{3*7}.$

The logarithm of a division can be expanded by subtracting the numerator and denominator (while still keeping the log). The logarithm of a product can be expanded by adding the terms while keeping the log. If the logarithm is raised to a power, we can bring it down as a factor:

$log_2 \frac{5^2}{3*7} = log_2(5)^2 - log_2 (3*7) = 2 log_2(5) - (log_2 3 + log_2 7)$