Answer:
y=15
x=43
(any variable can be used, I used x and y to make it easier to show)
Step-by-step explanation:
x+y=58
x-y=28
get x by its self
x=58-y
then subsitute into the other equation
(58-y)-y=28
58-2y=28
-2y=-30
y=15
sub. again
x+15=58
x=43
Answer:

Step-by-step explanation:
we know that


therefore

Answer:
D
Step-by-step explanation:
Answer:
1m cm
10m mm
Step-by-step explanation:
Answer:
The correct answer is "
".
Step-by-step explanation:
According to the question,
Number of students,
= 35
A ! mid term A,

B : final A,

Didn't start,

Now,
⇒ 

then,
⇒ 

hence,
The probability will be:
⇒ 
⇒