Solve the problem.A rumor is spread at an elementary school with 1200 students according to the model 
where N is the number of students who have heard the rumor and d is the number of days that have elapsed since the rumor began. How many days must elapse for 500 to have heard the rumor?
Fill in the blank(s) with the appropriate word(s).
about 3.4 days
Mathematics
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Solve the inequality 
. Restrict your attention to positive values of x. Round your answer to two decimal places.
?
A. 
B. ?
C. ?
D. ?
Mathematics
Graph the equation. Select integers for x, -3 ? x ? 3.y = x2 + 3
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.The hydrogen potential, pH, of a substance is defined by 
where the hydrogen ion concentration, [H+], is measured in moles per liter. Find the hydrogen ion concentration of a solution whose pH is 7.4.
A. 3.98 × 10-8 moles per liter B. 0.86923172 moles per liter C. 2.51 × 107 moles per liter D. -0.8692317 moles per liter
Mathematics
Find a positive angle less than 360° or 2? that is coterminal with the given angle.
A. 
B. - 
C. 
D. 
Mathematics