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nasty-shy [4]
3 years ago
6

Evaluate aa when a equals -2. 1)-4 2)4 3)1/4 4)-1/4

Mathematics
2 answers:
olga_2 [115]3 years ago
7 0

For this case we have:

Let

a = -2

If we want the result of the product a * a, we have:

a * a = (- 2) (- 2)

The law of multiplication of signs states that:

- * - = +

- * + = -

+ * - = -

+ * + = +

Also,2 * 2 = 4

So, we have to evaluate a = -2, the product a * a is given by:

a * a = + 4

Answer:

Option 2


Sav [38]3 years ago
5 0
A= -2
aa= -2(-2)= 4
Hence, the correct answer is the second option, 4.
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Answer:

A. "an arithmetic sequence with a common difference (d) of -6."

B. 33 hours

C. a_n=a_1+(n-1)d

D. See below

Step-by-step explanation:

A.

Since the sequence lessens by 6, this is an arithmetic sequence with a common difference (d) of -6.

B.

The formula for term of arithmetic sequence is:

a_n=a_1+d(n-1)

Wher a_1 is the first term and d is the common difference. Since we want to find after 33 weeks, we plug in 33 into n:

a_{33}=225 + (-6)(33-1)\\a_{33}=33

She will have left 33 hours

C.

We will use the arithmetic sequence term formula written above, that is:

a_n=a_1+(n-1)d

THis gives us the amount of hours left after a certain number of weeks.

D.

We plug in 40 into n and find the hours left:

a_{40}=225+(40-1)(-6)\\a_{40}=225-234\\a_{40}=-9

THis term is NEGATIVE, which means that Greta will not have to work 40 weeks to fulfill the target of 225 hours. She needs to work less.

6 0
3 years ago
4. The use of wind power is growing rapidly. Global wind power generating
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In 1980, wind turbines in Europe generated about 5 gigawatt-hours of energy. Over the next 15 years, the amount of energy increased about 59% (each year). How many gigawatt-hours were generated
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icang [17]

Answer:

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Step-by-step explanation:

The easiest approach is to realise that one hour is 3 times longer than  

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Step-by-step explanation:

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Which is bigger 17.5 or 1/6
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17.5 is bigger.1\6 is small.
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Read 2 more answers
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