Answer:
-10°
Step-by-step explanation:
take 24°+8°= 32
beacuse there was a decrease of 7° per hour for 6 hours you must subtract 7° six times from 32°
–1 > –2(x – 4) – 5(4x – 7)
distribute
-1> -2x+8-20x+35
combine like terms
-1> -22x+43
subtract 43 from each side
-44> -22x
divide by -22 (remember to flip the inequality symbol)
2<x
To write an expression in function notation, you must solve it for the dependent variable.
Assuming that you want the expression to be written in the form 
(i.e., assuming that x is the independent variable), we have to solve the expression for y, which means that we want y to remain alone on the left hand side, and move everything else to the right hand side.
So, first of all, we can add 9x to both sides to get
Finally, we divide both sides by 3:
Mean: 8
Median: 6. Since you get 4 and 8 left and the mean of 4 and 8 is 6
If the discriminant is negative no real solution exists.
If the discriminant is equal to 0 only one real solution exists.
If the discriminant is positive 2 real solutions exist.
The discriminant:
D = b² - 4 a c
1 ) - 7 x² + 6 x + 3 = 0
D = 6² - 4 · ( - 7 ) · 3 = 36 + 84 = 120 > 0
Answer: b) two solutions
2 ) - 8 x² - 8 x - 2 = 0
D = ( - 8 )² - 4 · ( - 8 ) · ( - 2 ) = 64 - 64 = 0
Answer: a ) one solution
