Solve is the certain answer, not "check the equation" silly. Now, I must solve some more problems on Brainly :)
Sin (A) = BC/AB = 21/75= 7/25
Answer:
Step-by-step explanation:
Both 115 and 145 mph are above the mean. Draw a normal curve and mark these speeds. 115 mph is 1 standard deviation above the mean; 130 would be 2 standard deviations above the mean; and 145 would be 3 s. d. above it.
We need to find the area under the standard normal curve between 115 and 145. This is equivalent to the area under the standard normal curve between z = 1 and z = 3.
I used my TI-83 Plus calculator's DISTR function "normalcdf(" to calculate this area: normalcdf(1, 3) = 0.1573.
The area between z = 1 and z = 3 is 0.1573. In other words, the percentage of serves that were between 115 and 145 mph was 15.73%.
Distribute the numbers, solve for y. y= 4
The answer is c because of Pythagorean’s theorem. a^2 + b^2 = c^2
So 5^2 + 12^2 = 13^2
25+144=169
