Answer:
1.5 * 10^(-4) is the scientific notation.....
Are you sure this is college mathimatics bec this doesn't look like it
Step-by-step explanation:

<span>4x + 3y = 12
-2x - 5y = 1
multiply bottom by 2
</span><span>4x + 3y = 12
-4x - 10y = 2
add both equations
-7y = 14
divide by 7
y = -2
plug into first equation
4x + 3(-2) = 12
solve for x
4x = 18
x = 4.5
</span>
11 oz = 311.845 or 311.8 grams
1,000grams = 35.274 or 35.3 oz