Answer:
x≤9
Step-by-step explanation:
x−6≤3
Add 6 to both sides of the inequality.
x≤3+6
Add 3 and 6.
x≤9
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Suppose the number of 2 hours lessons are x and 1 hour lessons are y; thus,
2x+y=25
50x+30y=690
to get the values of x and y we solve the quadratic equation given;
from the top equation:
y=25-2x.......i
substituting i in our second equation we get:
50x+30(25-2x)=690
50x+750-60x=690
-10x=-60
thus;
x=6
hence we conclude that the number of 2 hours classes are 6 hours
E is irrational (it cannot be expressed as the ratio of two integers).
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7xy+2x+3+3xy
7xy+3xy+2x+3 ( combine like terms)
7xy+3xy=10xy
Answer: 10xy+2x+3
your answer is going to be numbers 3