I would go with 45,45, 90 because first you can eliminate C and D.
C because it is not an equilateral triangle and D because you can figure it out.
Now you have A and B. A 30, 60 90 Degree Triangle would mean that none of the sides are equal (or the legs don't equal the hypotenuse when you put it in Pythagorean form [a²+b²=c²]). However if you translate the problem to answers that are easier to understand: {(7√3 = 12.124)² + 21² = 587.8944 = 14√3} Then you can see, two angles are equal to each other. So the answer is B.
Answer:
15 degrees
Step-by-step explanation:
Since ABD is a right angle it equals 90 degrees
ABC is 75 degrees
ABC + CBD = ABD
75 + CDB = 90
Subtract 75 from each side
75-75 + CDB = 90-75
CDB = 15
The other angle is 15 degrees
Answer: 60 square units
Step-by-step explanation:
If you're supposed to find area it would be 5x7 + 5x5 = 35 + 25 = 60
Answer: 0.0228
Step-by-step explanation:
Given : The mean and the standard deviation of finish times (in minutes) for this event are respectively as :-

If the distribution of finish times is approximately bell-shaped and symmetric, then it must be normally distributed.
Let X be the random variable that represents the finish times for this event.
z score : 

Now, the probability of runners who finish in under 19 minutes by using standard normal distribution table :-

Hence, the approximate proportion of runners who finish in under 19 minutes = 0.0228
Here it is. You can also use the quadratic equation to find the answer.