Where did jacob make a mistake, and what was the error?

a.
jacob made a mistake at step 2. the actual evaluation of the rewritten equation at x = 2 is 3.
b.
jacob made a mistake at step 4. the actual evaluation of the rewritten equation is approximately -1.636.
c.
jacob made a mistake at step 5. he should have used x = as the new upper bound.
d.
jacob did not make any mistakes in the calculation process.

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

At the olympic games, many events have several rounds of competition. one of these events is the men's 100-meter backstroke. the upper dot plot shows the times (in seconds) of the top 8 finishers in the final round of the 2012 olympics. the lower dot plot shows the times of the same 8 swimmers, but in the semifinal round. which pieces of information can be gathered from these dot plots? (remember that lower swim times are faster.) choose all answers that apply: a: the swimmers had faster times on average in the final round. b: the times in the final round vary noticeably more than the times in the semifinal round. c: none of the above.

Aflower has 26 chromosomes. to create a new flower,how many would a sperm cell have what is called?