Answer:
78,000
Explanation:
8,000 is in the thousands place, the 4 in the hundreds place is too low to round it up to 9,000, so it gets rounded down to 78,000.
5 sec because it would be in mid air not moving for less than a sec
Cancel common factors. For instance,

For this expression, we have

The rule about negative exponents is that you put the base under "1" in a fraction and the negative exponent becomes positive. For example,

becomes

. So in your case,
Answer:
The quantities used by Manuela were correct
Step-by-step explanation:
The question is
Did Manuela use the right quantities?
Let
x -----> the parts of oil
y ----> the parts of vinegar
we know that
The ratio of the parts of oil by the parts of vinegar of recipe is

Determine the relation used by Manuela

Compare with the recipe


Is true, the quantities are proportional
therefore
The quantities used by Manuela were correct