Select the correct answer. The formula for the area of a trapezoid is A = 1/2(b1+b2)h. Which formula could be used to determine b1 when the other variables are known?
A b1 = 2/Ah +b2
B b1= Ah/2 - b2
C b1= 2A/h +b2
D b1= 2A/h - b2

Is each relation a function? if so, state whether it is one-to-one or many-to-one. 3. (-4,7), (-3,5), (1,4), (3,-8), (5,-11) 4. (-4,8), (-2,4), (0,1), (2,4), (4,8) 5. (-2, 1), (-2,3), (0,-3), (1,4), (3,1)

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours