Step-by-step explanation:

To leave answer in positive exponents, just leave the answer inverse of the negative exponents.
The 1st and 2nd question is 25.
Answer:
10 3/40
Step-by-step explanation: hope i helped
Ok I will add u to if you can help me with my test
Answer:
The first equation should be multiplied by 9 and the second equation by −4
Step-by-step explanation:
Given the simultaneous equation
First Equation: 5x − 4y = 28
Second equation: 3x - 9y = 30
In order to eliminate y, we must make the coefficient of x in both expression to be equal.
To do that the first equation should be multiplied by 9 (negative value of the coefficient of y in equation 2)and the second equation by -4( (coefficient of y in equation 1)