Pls show work ❤️ Use substitution to determine the number of solutions to the system below.

15x + 5y = 20
y = 8 - 3x

A. The system has no solutions

B. The system has one solution

C. Infinitely many solutions

(a) (8%) compute the probability of an even integer among the 100 integers 1! , 2! , 3! , until 100! (here n! is n factorial or n*(n-1)*(n-2) *… 1) (b) (16%) compute the probability of an even integer among the 100 integers: 1, 1+2, 1+2+3, 1+2+3+4, …., 1+2+3+… + 99, and 1+2+3+… + 100

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?