Answer:
Gina is 12 years old
Step-by-step explanation:
First, we will have to write these statements mathematically and then solve.
Let Gina's age be x, let Gina's brother's age be y and let Gina's sister's age be z.
The second statement"Gina's older sister is twice Gina's age" can be mathematically written as: z =2 x ---------------------------(1)
The next statement "Gina's brother is half Gina's age" can be mathematically written as y =
---------------------------------------(2)
Then the next statement "the sum of their ages is 42" can be mathematically written as: x + y + z = 42 ----------------------------(3)
We can now proceed to solve;
Substitute equation (1) and equation(2) into equation (3)
x + y + z = 42
x +
+ 2x = 42
Multiply through by 2
2x + x + 4x = 84
7x = 84
Divide both-side of the equation by 7
= 
x = 12
Therefore, Gina is 12 years old
I'm fairly certain that using that wire you can have the same area no matter what dimensions there are, but if you do the square root, or

of 19,001,900 then you get 4359.11688. So your dimensions are
4359.11688 x 4359.11688. To get area, do length x width to get <span>

.
Hope this helped! If it did, please give me a good rating and mark me brainiest.<span /></span>
Answer:
4 number
Step-by-step explanation:
16p+32q=1,280
Answer:
The correct choice is (0,-3)
Step-by-step explanation:
To convert from polar coordinates to rectangular coordinates, we use the parametric equations:
and 
The point given to us in polar coordinates is
.
where 
and 
and 
and 
The correct choice is (0,-3)
There will be excactly 400 fiction books. The ratio of fiction to all is 4 to 9, or 4 to 900.