2. brittany wanted to find out which wheels were best for her skateboard. she purchased 4 sets of new
wheels of different brands. she and a friend set up a course on her driveway. brittany rode through
the course 5 times on each set of wheels. her friend timed her with a stopwatch and recorded the
times. they averaged the times for each brand of wheels.
a. independent variable
b. dependent variable -
c. experimental group -
d. control group -
e. constants -

i dont know this but ask your teacher for !

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.

answer-

the statement that f(x) = |x+a| + b has exactly one x-intercept is sometimes correct.

solution-

it solely depends on b, whether the function will have one or two or zero x intercept.

this plot of the given function, f(x) = |x+a| + b will be the basic absolute value graph i.e v shape, with vertex translated to (-a, b), instead of origin.

1-   if b is zero, the graph will have exactly one x-intercept, at x= -a

2- if b is positive, the whole graph will be above the x-axis, hence it will have no x-intercepts.

3- if b is negative, the graph will be below the x-axis, hence it will have two x-intercepts.

∴ the statement is sometimes true.

it is a. i hope this .