well, -12+7 is 5 times (23-7=16) so that answer is 80 and 6-(-5*4=-20) so that is also 16
To solve this you just have to do the division from left to right. -48 divided by -4 is 12 and 12 divided by -4 is -3, which is your answer. Hope this helps!
The equation which is supposed to help you is this one:
a^2 - b^2 = (a+b) (a-b)
So, what we need to do here is apply this equation:
k^2 - 9h^2 =
k * k - (3h)^2 =
(k + 3h) (k-3h)
The correct answer is C.
Here we have to find the probability . Now express the probability in terms of standard normal cumulative distribution function. That is .
Now you can look up the probability from the standard normal tables. Its value is
You're on the right track. After you get both equations you need to cancel one of the variables. In this situation, it doesn't matter which variable you cancel out.