Answer:
So if Jill, Sabrina and Kelly write the report together, it will take 4 hours.
Step-by-step explanation:
We know that Jill and Sabrina can write a lab report together in 6 hours. We know that all people work at the same rate.
So, we conclude that it will take Jill or Sabrina 12 hours if they write the report themselves. Kelly will also need 12 hours to write a report because we know everyone is working at the same speed.
We conclude that if all three work together they will need three times less time. We get:
So if Jill, Sabrina and Kelly write the report together, it will take 4 hours.
The answer for ur question is
3(a+10)=3a+10
3a+30=3a+10
30-10=3a-3a
20≠0
hope this help
Answer:
11) 14 and 11
Step-by-step explanation:
i can't help in number 12 , sorry !
Answer:
895
Step-by-step explanation:
1 cm = 0.01 m
Just move the decimal 2 times to the right to get your answer. Can I get your Fortnite username? Thanks! It's fine if you don't want to, I like Fortnite, too! XD hope this helps!
Answer: 17.9
Step-by-step explanation:
Using Heron's formula:
Area of a triangle is given by:
√s(s-a)(s-b)(s-c)
Where a, b and c ara sides of the triangle and
S = (a+b+c) / 2
In the question above sides are :
XY=XZ= 20 and YZ=18
S = (20 + 20 + 18) / 2 = 58/2 = 29
Area = √29(29-20)(29-20)(29-18)
Area = √29(9)(9)(11)
Area = √25839
Area = 160.74513
Altitude = height(h)
Area = 0.5 × base × height
Base = yz = 18
160.74513 = 0.5 × 18 × h
160.74513 = 9 × h
h = 160.74513 / 9
h = 17.9 (3 s.f)
