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2 years ago

If f(x) = -2x + 4, what is f(-3)?

Mathematics

1 answer:

Korvikt [17]2 years ago

8 0

Answer:

Step-by-step explanation:

Hello!

To solve this, we can plug in -3 for x in the equation -2x + 4.

Evaluate:

f(x) = -2x + 4
f(-3) = -2(-3) + 4
f(-3) = 6 + 4
f(-3) = 10

The value of f(-3) is 10.

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Solve the inequality. -1/3w ≤ -5

omeli [17]

Answer:

$\frac{ - 1}{3} w \leqslant - 5$

$w \leqslant - 5 \div \frac{ - 1}{3}$

$w \leqslant - 5 \times - 3$

$w \leqslant 15$

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2 years ago

What is Something divided by something equals 140

inn [45]

Answers my vary but what i got is 140 divided by 10 = 14

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3 years ago

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A population is estimated to have a standard deviation of 9. We want to estimate the population mean within 2, with a 99% level

cupoosta [38]

Answer:

The sample required is $n = 135$

Step-by-step explanation:

From the question we are told that

The standard deviation is $\sigma = 9$

The margin of error is $E = 2$

Given that the confidence level is 99% then the level of significance is mathematically evaluated as

$\alpha = 100-99$

$\alpha = 1 \%$

$\alpha = 0.01$

Next we will obtain the critical value $\frac{\alpha }{2}$ from the normal distribution table(reference math dot armstrong dot edu) , the value is

$Z_{\frac{\alpha }{2} } = Z_{\frac{0.05 }{2} } = 2.58$

The sample size is mathematically represented as

$n = [ \frac{Z_{\frac{\alpha }{2} } * \sigma }{E} ]^2$

substituting values

$n = [ \frac{ 2.58 * 9 }{2} ]^2$

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3 0

3 years ago

Deepak wrote out the steps to his solution of the equation StartFraction 5 Over 2 minus 3 x minus 5 plus 4 x equals negative Sta

Anna35 [415]

Answer:

Step 1 is incorrect.

Step-by-step explanation:

The given expression is :

$\dfrac{5}{2}-3x-5+4x=\dfrac{-7}{4}$

In step 1, Deepak rearranged the terms in order to simplify like terms together that is followed in step 2.

o, rearranging of the terms of an expression is commutative property and not distributive property. The distributive property is generally applicable to multiplication and is given as:

$x(y+z)=xy+yz$

The commutative property is given as:

x+y = y +a

Therefore, adding terms by changing their order is commutative property of addition and not distributive property. Step 1 instruction is wrong.

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3 years ago

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Solve the system of equations below.

Ostrovityanka [42]

C - no solution
you take the second solution and times the entire equation by -1
then simply
and you get 0x + 0y = 20

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3 years ago

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