13. a ball is thrown into the air with an upward velocity of 40 ft/s. its height h in feet
after t seconds is given by the function - 1612 + 40t + 10. in how many seconds does
the ball reach its maximum height? round to the nearest hundredth if necessary.
what is the ball's maximum height?
a. 1.25 s; 85 ft
c. 1.25 s; 35 ft
b. 1.25 s; 40 ft
d. 2.5 s; 10 ft

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents

Stu and ambrose are working together on a study of whether diet is related to students' mental health. first, they randomly select 10 students from the student center and 10 students from the office of counseling and psychological services. then, they ask students to rate their diet in terms of healthiness on a scale of 1-100 before completing a 20-item mental health survey. a) name one of the constructs being studied b) how was the construct you named above operationally defined in this experiment? e) was the variable you described above their independent variable, their dependent variable, or a controlled variable? d) what is a confounding variable? what is a potential confound in this study?

Given: q = 7m + 3n, r = 11 - 2m, s = n + 5, and t = -m - 3n + 8. simplify r - [s + t]. m - 2n - 2 -m + 2n - 2 3m - 4n + 14 -3m - 4n + 14 (not this one)