Answer:
57
Step-by-step explanation:
Average = total points / total students
95 = (19×97 + x) / 20
1900 = 1843 + x
x = 57
The lowest the last test score can be for the whole class to average a 95 is 57.
Answer:
Greater than.
Step-by-step explanation:
Let the original value be x.
A 50% increase in x is given by
x + 50%x
=> x + 0.5x
=> 1.5x
Followed by a 33 % decrease in the value gives:
1.5x - 33 %(1.5x)
=> 1.5x - 0.33(1.5x)
=> 1.5x - 0.495x
=> 1.005x
Since 1.005x is greater than the original value, x, then:
A 50% increase followed by a 33 % decrease gives a value that is greater than the original.
Answer:
No solution
Step-by-step explanation:
Let's solve using substitution (substitute 15x+2 for y):
-15x+15x+2=1
2=1
No solution
Another method...
Since these lines have the same slope, but different y-intercepts, they are parallel. This means they will not intersect therefore there is...
No solution
Answer:
-2
Step-by-step explanation:
Take 0 and put it in as x in the equation, you are left with y = ? as -4x0 = 0. When x = 0, y = -2, so -2 would be the answer. You can then check it by plugging x into the equation with -2 and see if you get the y as a result.