Answer:
6
Step-by-step explanation:
We can fill in what we know which is the length and perimeter.
82=2(35)+2(w)
Multiply 35 x 2 = 70
82-70= 12
12/2=6
A=(v-u)/t
We know a=2.5, v=40, u=10, so:
2.5=(40-10)/t
2.5t=40-10
2.5t=30
Divide both sides by 2.5
t=12 It takes 12 seconds for the car to reach 40m/s
To find out how far it went, you do:
d=v+1/2 at^2
d=10+1/2(2.5)(12)^2
d=10+1/2(2.5)(144)
d=10+(1.25)(72)
d=10+90
d=100m
Hope this helps :)
6.40x+9.90(154-x)=1230.90
Solve for x
X=84 for child
154-84=70 for adults
3 seconds
0= -16t^2+144
-144/-16=9
9=t^2
Sq rt of 9 is 3
