First we will calculate rate of work of rosa and amy.
work done by rosa in time t=t*1/7
Work done by Amy and rosa=t(1/7+1/4.2)
t/7+t/a=t/4.2
t=10.5 hr
Always keep remember those formula or logic belowWork rate × Time to finish the job = 1 job done
Work rate = (1 job done) / (Time to finish the job)
Time of doing the job = (1 job done) / (Work rate)
 
        
        
        
Answer:
I used my name, lol
Step-by-step explanation:
Kat wants to use her money to support animals at a shelter after receiving her pay check from work . She pays $15 per animal, and leaves $20 for the workers. She can spend at most $130. How many animals can she help?
Solve for x

Add 20 to both sides to isolate x

Divide each side by 15

Kat can help at most 10 animals.
(I am so sorry I took so long, I couldn't come up with anything.)
 
        
             
        
        
        
Answer:
h=12
Step-by-step explanation:
by cross multiplying we get 1h=12 or h=12 so h=12
 
        
             
        
        
        
Oh boy, here we go again 
First we must convert  1 2/3 to an improper fraction.  By doing this, we get 5/3  (3/3 + 2/3)
So now we have 273 /  5/3
To divide this easier we can do something that when I learned it was called (keep, change, flip)  which basically means keep the first fraction, change the sign from division to multiplication, and flip the second fraction
This now turns into:  273/1 * 3/5 
Combine 273 and 3/5
273⋅3/5
Multiply 273
by 3
819/5
is your answer
 
        
             
        
        
        
Answer:

Step-by-step explanation:
1) if to re-write the given equation into slope-interception form, then:

the slope of the given line is 5/2;
2) according to the rule of perpendicular, the required slope should be:
s*(5/2)=-1;
3) if to solve this equation (s*5/2=-1), then s=-2/5 or -0.4.