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4 years ago

Find f(-2) for f(x)=2x-5

Mathematics

2 answers:

Lelu [443]4 years ago

8 0

When x=-2 ,

2(-2)-5= -9

saul85 [17]4 years ago

7 0

Answer: -9

Step-by-step explanation:

So if f(x) is given, that is 2x-5, then to find f(-2) we need to substitute the value of x by -2

Therefore, f(-2) is,

2(-2)-5

= -4-5

= -4+-5

=-9

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enter the expression −2c⃗ 6d⃗ in the answer box using the notation just described. express your answer in terms of c⃗ and d⃗ . u

liraira [26]

The expression $-2\vec C+6\vec D$ in the ordered pair notation is (16,-16).

The vector components of a vector are represented as the ordered pair of its x and y components.

For example, if a vector has x - component 'a' and y- component 'b' , then the ordered pair notation for the vector is (a, b), where the vector is $a \vec i+b \vec j$ .

Now the vector C has its x- component = -2

y- component of C = -1

Therefore, ordered pair notation of C = (-2, -1)

x- component of D = 2

y-component of D = -3

Therefore, ordered pair notation of D = (2,-3)

So the expression $-2\vec C+6\vec D$ = -2 (-2,-1) +6 (2,-3) = (4,2) + (12, -18)

= (16, -16) in the ordered pair notation.

That is, the vector $\bold {-2\vec C+6\vec D}$ is a vector with x-component 16 and y-component -16.

Learn more about vectors at brainly.com/question/3184914

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4 0

2 years ago

A certain refrigerator requires 170 watts of electricity when it is running. It typically runs about 20 minutes per hour. How mu

Xelga [282]

If certain refrigerator requires 170 watts of electricity when it is running. It typically runs about 20 minutes per hour. The amount it cost to run this refrigerator for one year if the cost per kWh is $0.11 is: $53.856.

Given:

Electricity watts = 170 watts

Minutes run = 20 minutes

Cost per KWh =$0.11

Hence,

170 watts = 1.7×10^-1

20 min = 1/3 h

Now let calculate the cost of running the refrigerator for one year

1.7×10^-1 × 1/3 × 24 ×360 × $0.11

= $53.856

Therefore If certain refrigerator requires 170 watts of electricity when it is running. It typically runs about 20 minutes per hour. The amount it cost to run this refrigerator for one year if the cost per kWh is $0.11 is: $53.856.

Learn more about watts here: brainly.com/question/25781540

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1 year ago

Please help tysm if you do:)

zhenek [66]

Answer:

Step-by-step explanation:

when its exponents it will add

8 0

3 years ago

In a parallel circuit, ET = 120 V, R = 470 Ω, and XL = 500 Ω. What is the reactive power?