21:9:1/3
21x3/9=7
Answer: (C)
i think:
1/5=0.2
0----0.2----------------1
-2x + 11y =10
11y=10+2x
y=(10+2x)/11
here your graph:
https://www.desmos.com/calculator/2u2akgadig
he kicked my butt too )
doesn t it saying that initial speed was 2.5 and it speeded up to 4.2 in 6s
4.2-2.5 = 1.7 2.5+0.85 = 3.35 it is his avareage speed
3.35*6 = 20.1
the answer: 20
y² + 16 = 212
y^2=212-16
y^2=196
y=14 y=-14
apatmen houses private houses
4 : 14
4/14=2/7
2 7
the answer: 2:7
4 people take 2.5 hours to do 1/2 the job
people 4-10 4*5/2=10 job 1/2-1/3 1/2*2/3=1/3
10 people take x hours to do 1/3 the job
so: (150*2*2)/(3*5)=40
i did the same :P :D
