Answer:
Step-by-step explanation:
Answer:
- 9x² - 36x - 27
Step-by-step explanation:
9 - (3x + 6)² ← expand using FOIL
= 9 - (9x² + 36x + 36) ← distribute parenthesis by - 1
= 9 - 9x² - 36x - 36
= - 9x² - 36x - 27
Answer:
84
Step-by-step explanation:
first calculate the rectangle (6* 10 = 60) and then add that to the area of the triangles. 1/2(4) * 6= 2 * 6 = 12, and since there are two triangles: 12* 2 = 24, add that to the area of the rectangle and you get 84.
Answer: 1) 300 min
2) 680 min
Step-by-step explanation:
1) As the charge was $21 at 0.07, x is the minutes he used, we have:
0.07x = 21
x = 21/0.07
x = 300
2) As the charge was $40 and the company charges different rates for minutes, we know from 1 that the first 300 min costs $21, we have
40 - 21 = 19
So $19 was charged with the $0.05 fee. so:
0.05x = 19
x = 19/0.05
x = 380
300 + 380 = 680 min
No solution, because the discriminant is less than zero. hope this helps