Answer: 
Step-by-step explanation:
When you add fractions with different denominators, you need to find the Least common denominator (LCD):
Descompose the denominators (5 and 15) into its prime factors and then choose the commons and non-commons with the highest exponents:

Divide the LCD by each original denominator of each fraction and multiply the result by each original numerator of each fraction. After this, you can add the numerators and reduce the fraction.
Then:

Answer:
Step-by-step explanation:
It can be solved by applying formula for Force.
Force = mass * acceleration
Unit of force is N(newton)
one newton is the force applied on body when a body of mass one kg, accelerate at 1/ms^2 under the influence of force.
________________________
given
Mass = 5 kg
acceleration = 6/ms2
plug in the value of mass and acceleration in formula for for we have

Thus 30 N(newton) force is required to accelerate at 6m/s^2
The answer for the question is d
In this question, Suzan is taking 5 marble from a bag containing four red marbles, four green ones, two white ones, and two purple ones. The total marble in the bag should be: 4+4+2+2= 12. The question is how much the probability to get <span>two red, 1 green, 1 white and 1 purple. Then the probability would be:
4*3*4*2*2/ 12*11*10*9*8= 192/ 950400= 1/495</span>