Answer:
9) x = 9
10) x = - 8
11) x = 7
Step-by-step explanation:
9)
(180 - 15x + 4) + 7x + 1 + 67 = 180
180 - 15x + 4 + 7x + 1 + 67 = 180
-15x + 4 + 7x + 1 + 67 = 0
-8x + 72 = 0
72 = 8x
x = 9
10)
100 = x + 108
100 - 108 = x
x = -8
11)
10x - 1 + 17x - 8 = 180
27x - 9 = 180
27x = 189
x = 7
12+4+9+13+7+11+5+2+_+_ /10= 8
x10 both sides
12+4+9+13+7+11+5+2+_+_=80
63+_+_=80
-63 both sides
_+_= 17
any two numbers that add up to 17 can go in the planks
7,10
Answer:
5.2 seconds
Step-by-step explanation:
Traveling straight down: 90 * 3.5 = 315 feet down
Traveling up: 30 * 2.2= 66
315-66= 249
249/48= 5.1875 seconds
5.2 seconds <- rounded
The answer is 15.000 I hope this helps your question;)