Which is a zero of the function defined by the following equation: f(x)= 5x-20

Mathematics

2 answers:

Step2247 [10]4 years ago

7 0

So, if you graph it, the y-intercept is at -20 and the slope is 5. It will hit your zero(s) at the x-intercept of x=4

kykrilka [37]4 years ago

5 0

F(x) = 5x - 20
5x - 20 = 0
 + 20 + 20
 5x = 20
 5 5
 x = 4

You might be interested in

For the function f(x) = (x − 2)2 + 4, identify the vertex, domain, and range. (2 points)

Leto [7]

Answer:

okay

vertex:(2,4)

domain: (-∞,∞)

range: [4,∞)

Step-by-step explanation:

to find the vertex from the equation

f(x) = (x − 2)² + 4

an easy way is to use the numbers given. so the vertex of this equation is x= 2 (because it is always the opposite of itself in the equation) and y= 4 because the point is going up 4.

to find domain is easy. domain is on the x-axis so the equation is a parabola so it has to points at the same direction. therefore it has a domain that goes from negative infinity to positive infinity.

lastly to find range, which is on the y-axis is to find from where the parabola starts and is pointing, either up or down. in this equation the vertex, which is also the starting point starts at 4 and continues to go on- to infinity.

ps i hope this helps.

3 0

3 years ago

In a random sample of 80 teenagers, the average number of texts handled in one day is 50. The 96% confidence interval for the me

Naily [24]

Answer:

Standard deviation of the sample = 17.421

Step-by-step explanation:

We are given that in a random sample of 80 teenagers, the average number of texts handled in one day is 50.

Also, the 96% confidence interval for the mean number of texts handled by teens daily is given as 46 to 54.

So, sample mean, $xbar$ = 50 and Sample size, n = 80