Answer: 4 right angles
Step-by-step explanation:
A square has four right angles, as all the four angles of a square is equal, that is there are 4 equal sides in a square.
I hope this helps.
30000 is the answer I think
let the weight of the second alloy be y
convert the percentage to fraction, that is 10/100=0.1, 18/100=0.18, 13/100=0.13
Total weight if the mixture is 0.1 x 25+0.18y=0.13(25+y)
2.5+0.18y=3.25+0.13y
like terms together
0.18y +0.13y = 3.25-2.5
0.05y=0.75
divide both side by 0.05
Y is therefore 15 pound of 18% copper is needed
The equations of both the sister are the same.
<h2>Expression
</h2>
In mathematics, an expression is defined as a set of numbers, variables, and mathematical operations that are formed according to rules which are dependent on the context.
<h2>Given to us</h2>
Gabriel Equation:
,
Gabriel's Sister Equation:
,
<h3>Gabriel's Sister Equation</h3>
On further solving the equation we get,

As we can see the equation transformed to Gabriel's Equation of total cost.
Therefore, both the sisters are correct as the equations of both the sister are the same.
Learn more about Expression:
brainly.com/question/13947055