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butalik [34]
4 years ago
15

Evaluate the function f(x)=2x-2 when x equals negative 1 A. -4 B. -3 C. 0 D. 4

Mathematics
1 answer:
Alona [7]4 years ago
8 0
F(x)= -4. 
Just plug in -1 for your x in 2x-2 and solve like a normal equation. Think of f(x) a your y because that's basically what it is. If it helps, the equation is basically:
y=2x-2 so you would just solve for y by plugging in -1 into x.
You might be interested in
Jack bought two sweaters for $17.99 and a pair slacks for $25.50. including a 5 1/2% tax, how much was his total purchase?
Stella [2.4K]
⓵ When I see fractions, I usually start by transforming my fraction into a decimal because I find it easier to work with :

5 ½ = 5 + (1 ÷ 2) = 5 + 0,5 = 5,5%


⓶ Then, once you got rid of that fraction, I usually transform a percentage into a decimal because, again, I find it easier to work with :

5,5% = 5,5 ÷ 100 = 0,055


⓷ The next step would be to add both prices together in order to get one unique price to work with instead of two :

$17,99 + $25,50 = $43,49


⓸ Next, you need to multiply the total price you calculated at #3 by the decimal of the pourcentage that you calculated at #2 in order to find the tax amount on his purchase :

5 ½% of $43,49

↓

5,5% of $43,49

↓

0,055 × $43,49 = 2,39195

Since we are calculating money, you need to round up this number at the hundredths, wich means that you’ll end up with about $2,39 of taxes on your total purchase!

⓹ The last and final step is to add the tax amount that you just calculated in #4 to the total price you calculated at #3 in order to find the total of his purchase including the 5 ½% taxes :

$43,49 + $2,39 = $45,88

If you wanted to be a tiny bit more precise, you could have decided not to round up the tax amount in #4 and just round up the final amount ↠

$43,49 + 2,39195 = 45,88195

Wich would, in this case, given you the same exact answer which is : $45,88

But it is important to keep in mind that sometimes the answer might vary if you round up only at the end, depends on your teacher’s exigences more than anything!

→ So the final answer is that his total purchase including a 5 ½% tax is : $45,88!

I really hope this helps, if there’s anything just let me know! ☻
4 0
3 years ago
A batter strikes a baseball. the equation y = -0.005^2 +0.7x + 3.5 models its path, where x is the horizontal distance, in feet,
hram777 [196]

Answer:

(D)144.8 feet

Step-by-step explanation:

Given the equation which models the path of the baseball

y = -0.005x^2 +0.7x + 3.5

where x is the horizontal distance, in feet, the ball travels and y is the height, in feet, of the ball.

To determine how far from the batter the ball will land, we determine the distance x at which the height, y=0.

y = -0.005x^2 +0.7x + 3.5=0

-0.005x^2 +0.7x + 3.5=0

We use the quadratic formula to solve.

In the quadratic equation above, a=-0.005, b=0.7, c=3.5

x=\dfrac{-b\pm\sqrt{b^2-4ac} }{2a} \\=\dfrac{-0.7\pm\sqrt{0.7^2-4(-0.005*3.5)} }{2*-0.005} \\=\dfrac{-0.7\pm\sqrt{0.49+0.07} }{-0.01}\\=\dfrac{-0.7\pm\sqrt{0.56} }{-0.01}\\x=\dfrac{-0.7+\sqrt{0.56} }{-0.01} \: or\: x=\dfrac{-0.7-\sqrt{0.56} }{-0.01}\\x=-4.83 \: or\: x=144.83

Since x cannot be negative, x=144.8 feet to the nearest tenth of a foot.

<u>The correct option is D.</u>

6 0
3 years ago
8 mm
rjkz [21]

Answer:

40 + 40 + 125 + 125 + 200 + 200 = 730

Step-by-step explanation:you need to find the area of every square/rectangle in the figure, so 2 of the shapes are 8 x 5, 2 of them are 5 x 25, 2 of them are 8 x 25 getting you 730 mm^2

4 0
4 years ago
Use complete sentences to explain how you could use a number line to explain why 2 &lt; 3 &lt; 5. Please. :D
Svetach [21]
Two is less than three which is also less than 5.


When put into a number line from 0 to 10, it shows that 2 is closest to 0 while 5 is closest to 10 and three, will be in between 2 and 5. This shows that as you go from 2 to 3, the number increased and, it continues to increase when you go from 3 to 5. This shows that 2 is less than 3 and 3 is less than 5.
7 0
3 years ago
How many 3/4s go into 4
snow_lady [41]

Answer: I THINK 5 OF THEM

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
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