A number z squared, decreased by 7
1 answer:
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Answer:
Step-by-step explanation:
Given
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Required
Express the answer in
From the question, we have:
breath/person in a year
The number of breath is calculated by:
So, we have:
Reorder
Using scientific notation ;
The value (a) must be in the following interval
So, we have:
By comparing the above with:
Answer:
Step-by-step explanation:
Set this up as a proportion with the ratios being
If there is a 2:5 ratio of vinegar to oil, that ratio looks like this:
and if we are looking for how much oil, x, is needed for 20 ml of vinegar, then that ratio completes the proportion:
and cross multiply.
2x = 100 so
x = 50 ml of oil