Which one of the following is a combustion reaction?
a. ch4 + 2o2 → co2 + 2h2o
b. ba(oh)2 + 2hclo4 → ba(clo4)2 + 2h2o
c. 4fe + 4o2 → 2fe2o3
d. zn + hcl → zncl2 + h2

its 42

i say its d?

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.