Answer:
Domain: x>=1
Step-by-step explanation:
what values of x make it work (square roots must be greater than or equal to zero)
sqrt (5x-5) >=0
square each side
5x-5 >=0
add 5 to each side
5x>=5
divide by 5 on each side
5x/5 >=5/5
x >=1
This is interesting. You cannot turn 1/4 or 2/4 or 3/4 into a mixed number because they are proper fractions. Perhaps ask your teacher about it? Or just rewrite the fractions as is and state they are in proper form.
Same with 7. They are each simplified already. I would suggest asking your teacher.
B.
It says x = y + 3. So what they did was put y + 3 in the place of x.
To get the result we can use knowledge that reading is 2 times longer than HW.
To find this value we just have to multiply 42 times 2 so
40*2=80
Its 1 hour and 20 min - its the result
