Answer:
Question 9 = 5.5 hours (Cross multiplication)
Answer:
2 =6
3= 9
4=12
5=15
Step-by-step explanation:
Formula is 3x
2 x 3= 6
3 x 3=9
4 x 3= 12
15/3= 5
Answer: she would be 19 years old right now.
Step-by-step explanation:
14 years plus another 5 equals 19 years.
X - speed of the current
40+x - speed with current
40-x - speed against current
t-time
(40+x)*t=100
(40-x)*t=60
40t+xt=100
<span> + 40t-xt = 60
</span> 80t =160
t = 2
40t+xt=100,
40*2+2x=100
80+2x=100
2x=100-80
2x=20
x=10 mi/h
10 mi/h speed of the current.
The surface area of a sphere is
4 π (radius)²
= 4 π (40 m)²
= 4 π (1600 m²)
= 6400 π m²
First choice.
