MATHEMATICS HIGH SCHOOL

If f(x)=-5x^2-3x+4 what is the value of f(-1)
A:12
B:-2
C:2
D:-12
E:10

Answers

Answer 1

Answer:

Answer:

Step-by-step explanation:

to evaluate f(- 1) , substitute x = - 1 into f(x)

f(x) = - 5x² - 3x + 4 , then

f(- 1) = - 5(- 1)² - 3(- 1) + 4 = - 5(1) + 3 + 4 = - 5 + 7 = 2

Related Questions

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Help please!!A candle burns down at the rate of 0.5 inches per hour. The original height of the candle was 8 inches.Part A: Write a list of 6 ordered pairs to show the height of the candle in inches (y) as a function of time in hours (x) from the first hour after it started burning. For example, the point (0, 8) would represent a height of 8 inches after 0 hours. Explain how you obtained the ordered pairs. (5 points)Part B: Is this relation a function? Justify your answer using the list of ordered pairs you created in Part A. (2 points)Part C: If the rate at which the candle burned was 0.4 inches per hour instead of 0.5 inches per hour, would the relation be a function? Explain your answer using input and output values. (3 points)
Which description is represented by a discrete graph
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What is the probability of getting 2 heads up and 1 tails up when flipping three coins?A. 1/6B. 1/4C. 3/8D. 2/3

A pair of pants with a marked price of $35.00 has a discount of 20%. How much is the discount? Can someone help me learn to do problems like this please?

Answers

when you see a "%" you need to ask " a percent of what"?

Here, it's a percent of the original prize, so the discount is 20% of the original prize, that is 20% of 35.

20% is also 20/100 or 1/5, so we can calculate this like this:

$(1)/(5) *35=7$

so the discount is 7 dollars.

What is the exact area of a circle whose diameter is 18 cm? A. 9 straight pi cm2 B. 18 straight pi cm2 C. 36 straight pi cm2 D. 81 straight pi cm2

Answers

The formula for the area of a circle is:

A=πr²

We also know that the diameter of a circle is twice the size of its radius

d=2r

So if the diameter is 18...

18=2r

divide both sides by 2

9=r

The radius of the circle is equal to 9cm

Now we can solve for the area

A=πr²

A=π9²

A=π81

A=81πcm²

The exact area of a circle whose diameter is 18cm is 81πcm²

Answer=D

The data set gives the number of hours it took each of the 10 students in a cooking class to master a particular technique. {5, 3, 5, 30, 4, 5, 4, 3, 4, 5}

what is the best measure of center for this data set (FQ, mean, median, or range) , and its value is (3, 4, 4.5, or 6.8)

Answers

Answer: The best measure of center for this data set is median , and its value is 4.5 .

Step-by-step explanation:

The given data set : {5, 3, 5, 30, 4, 5, 4, 3, 4, 5}

We can see that it has an outlier (i.e. 30) which is extremely large from all the values.

We know that to measure the center of tendency we measure one of three things arranged in ascending order:

Mode< Median <Mean

But mean gets affected by outlier value.

Then the best measure of center for this data set must be Median.

For this, arrange given data set in order:

{3 ,3 ,4 ,4 ,4 ,5 ,5 ,5 ,5 ,30 }

Since , the number of data values = 10 (even)

Then , Median = Mean of two middle most numbers

$(4+5)/(2)=4.5$

Hence, the best measure of center for this data set is median , and its value is 4.5 .

Alex and Ben were given a total of £360 they shared the money in the ratio 5:7 Ben received more money then Alex.how much more?

Answers

first
360 divided by 12=30
alex got=30 multiply 5=150
ben got=30 x 7 =210
so ben got 60 more than alex

5:7 means that Alex got 5/12 of the whole amount and Ben 7/12.
(5/12)•360=150
(7/12)•360= 210
210-150=60
Ben received £60 more than Alex.
Hope it helps :)

Which of ordered pairs is not a function ? 1.) (0,9) , (9,0) , (1,2) , (3,4)
2.) (0,1) , (-1,0) , (1,2) , (3,2)
3.) (2,3) , (3,4) , (4,5) , (5,6)
4.) (2,3) , (2,4) , ( 4,5) , (4,6)