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 angles. measure need asap

The data represents the semester exam scores of 8 students in a math course. {51,91,46,30,36,50,73,80} what is the five-number summary?

According to the 2008 u. s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of florida was approximately two times the population of california. b. the population of florida was approximately twenty times the population of california. c. the population of california was approximately twenty times the population of florida. d. the population of california was approximately two times the population of florida.