Answer: Option 'a' is correct.
Step-by-step explanation:
Since we have given that
Probability that he jumps a hurdle = 
Total number of hurdles = 10
Probability that he knocks down = 
So, Probability (knocks down all hurdles ) is given by
Hence, Option 'a' is correct.
Answer: 10 inches.
Step-by-step explanation:
We have to solve a system of equations.
The formula to calculate a triangle area is A = (b.h)/2
where b is the base and h is the height. This will be our first equation.
Since the height is 4 inches greater than the base, the second equation will be: h = b+4
We replace h and the value of the area (70 square inches) in the first equation, and we solve it by using the cuadratic equation formula:
70 = (b . (b+4)) / 2
70 . 2 = b² + 4b
140 = b² +4b
0 = b² + 4b - 140
The roots of this polynomial are -14 and 10. Since a distance can't be negative, the length of the base is 10 inches.
This is the answer simplified into the most specific terms
Answer:
-4
Step-by-step explanation:
