True
Variables is changing. It is any factor, trait or condition that can exist in differing amounts or types. An experiment has three types: Independent, Dependent and Controlled.
To INcrease the strength of an electromagnet ...
... INcrease the number of windings
... INcrease the electric current (by increasing the voltage of the battery)
... change the core from wood to iron
I think you have them all marked correctly
7. They carry hereditary material from parent
8. 50 percent
1. Nutrition
2. X-linked dominant
If Im wrong Im sorry. its been like 4 years since i took biology but i remember some things
Answer:
Slower speed = 70 mph
Faster speed = 100 mph
Explanation:
Let the slower speed be x miles per hour
Then, the faster speed = (x+30) miles per hour
Let the time spent driving at the slower speed (that is, at x mph) = t
Then, time spent driving at the faster speed (that is, at (x+30) mph) = 2t
speed = (distance)/(time)
Distance = speed × time
Distance covered during the slower speed = x × t = xt = 70 (given in the question)
xt = 70 (eqn 1)
At the faster speed
Distance covered = (x+30)(2t) = 2t(x+30)
Distance covered during faster speed = 200 miles
2t(x+30) = 200
2xt + 60t = 200
Recall (eqn 1)
xt = 70
2(70) + 60t = 200
60t = 60
t = 1 hour.
xt = 70
Slower speed = x = 70 mph
Faster speed = (x+30) = 100 mph