Medical researchers have determined that for exercise to be beneficial, a person’s desirable heart rate, r, in beats per minute, can be approximated by the formulas

for women
for men,

where a represents the person’s age. if the desirable heart rate for a man is 135 beats per minute, how old is he?

a.
22.5 years old
b.
40 years old
c.
45 years old
d.
42.5 years old

select the best answer from the choices provided

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Which linear function represents the line given by the point-slope equation y + 1 = –3(x – 5)?

Select the correct answer. given: ∆abc with prove: statement reason 1. given 2. ∠cab ≅ ∠edb ∠acb ≅ ∠deb if two parallel lines are cut by a transversal, the corresponding angles are congruent. 3. ∆abc ~ ∆dbe aa criterion for similarity 4. corresponding sides of similar triangles are proportional. 5. ab = ad + db cb = ce + eb segment addition 6. substitution property of equality 7. division 8. subtraction property of equality what is the missing statement in the proof? scroll down to see the entire proof.