Answer:
y = 2x - 4; Alex is 18.
Step-by-step explanation:
Since Alex is 4 years younger than 2 times his sister's age, and his sister is y and Alex is x, the function of y to x must be y = 2x - 4.
According to the rule, if Alex's sister is 11, Alex is 2 times that minus four. If you calculate that, you get
11 * 2 = 22
22 - 4 = 18
So Alex is 18 if his sister is 11.
Answer:
41
Step-by-step explanation:
The perimeter is the sum of all a shapes sides.
so if length is two times the width, you could write it as 2w.
2w + 2w + w + w = 42. Simplified, it's 6w = 42.
Divide both sides by 6, and you get w = 7.
Since the length is 2w, 2 * 7 = 14, so the length is 14
Area of rectangle is length * width, so do 14 * 7 which is 98. Slap on some units and your answer is 98 sq m
6a-2(a-1)
6a-2a-2
4a-2
I think it is 4a-2
of 
is 
Solution:
Given of what number is .
Let us first convert the mixed fraction into improper fraction.
Now, let us take the unknown number be x.
Do the cross multiplication.
Now, again change the improper fraction into mixed fraction.
Hence of is .
