All categories

3 years ago

F(x)=−4x 2 +5x \text{Find }f(6) Find f(6)

Mathematics

1 answer:

Vilka [71]3 years ago

7 0

Answer:

-114

Step-by-step explanation:

f(x) = -4x^2 +5x

Let x = 6

f(6) = -4(6)^2 +5(6)

= -4(36) +30

- 144+30

= -114

You might be interested in

A freelancer, who specializes in digital marketing, is interested in the average amount of money small businesses spend on pay p

Lapatulllka [165]

Answer:

The freelancer needs to calculate the value of the observed test statistic - average annual pay per click advertising cost - in order to compare with the critical value.

Step-by-step explanation:

His hypothesis test will be:

Null hypothesis: Average Annual Pay per click advertising cost is still less than 3300 dollars

(Note: the null hypothesis is the fact that the experimenter wishes to refute)

Alternative Hypothesis: Average annual pay per click advertising cost is now above 3300 dollars

(Alternative hypothesis is the fact that the experimenter expects to be true)

The Critical Value is a cutoff value for which if the value of the observed test statistic exceeds it, the null hypothesis is refuted and if the value of the observed test statistic is below it, the null hypothesis remains.

That is, either the freelancer accepts that the cost has not risen or he accepts that the cost has risen.

7 0

3 years ago

Find the equation of a line parallel to the line 2x-y-9=0 and passing through the point of intersection of the lines 5x+y+4=0 an

Cerrena [4.2K]

Answer:

$y=2x-3$

Step-by-step explanation:

1. Using the point of intersections, we use the substitution method to find the coordinates of the line parallel to $2x-y-9=0$

$5x+y+4=0$

$y= -4-5x$

substituting the value of y in $2x+3y=1$ :

$2x +3(-4-5x)=1\\\\2x-12-15x-1=0\\-13x=13x\\x= \frac{13}{-13}= -1$

substituting x=-1 in y= -4-5x:

$y= 1$ (upon solving, you should get this)

$(x,y)= (-1,1)$

2. Using y=mx+c and making y the subject of the formula 2x-y-9=0 and using the coordinate we found earlier, we will find the equation of the parallel line. (We make y the subject of the formula to find the gradient)

$2x-y-9=0\\2x-9=y\\y= 2x-9$

$y= mx+c\\$

-1= 2 x 1 +c

-3=c

y= 2x-3

3 0

3 years ago

PLS HELP

LiRa [457]

There is 3600 seconds per hour.
Multiply the speed per second by 3600 to get the speed in miles per hour then convert to kilometer/hour.

4.9 * 3600 = 17,640 miles per hour

17,640 x 1.6 = 28,224 kilometers per hour

8 0

3 years ago

The gross federal debt y (in trillions of dollars) for a certain country in year x is approximated by the following equation,

miskamm [114]

Answer: 2008

Step-by-step explanation:

Given : The gross federal debt y (in trillions of dollars) for a certain country in year x is approximated by the equation $y =1.18x +1.58$ , where x is the number of years after 2000.