I think you mean 48. 4 * x = 48. x = 48/4 = 12
For this case we have that the variable "x" represents the number of hours that Leticia uses to take care of children on Saturday.
IF on Friday I use 4 hours ($ 8 each) and on Saturday "x" hours ($ 8 each) obtaining a profit of $ 72, we have the following equation:

We apply distributive property:

So, on Saturday she spent 5 hours.
Answer:

I would say 80, because without an estimate it'd be 79 and 79x5=395. So 80x5=400, which is the estimate of 395. So 80 is the answer
The relationship between cost and pounds of blueberries is y = (7/3)x
A linear equation is of the form:
y = mx + b
where y, x are variables, m is the slope of the line and b is the y intercept.
Let y represent the cost in dollars for x pounds of blueberries.
Since 6 pounds of blueberries cost $14, hence:
m = $14/ 6 pound = $7/3 per pound
Therefore the relationship between cost and pounds of blueberries is y = (7/3)x
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It's 300 because you divide 60 by 12 which gives you 5, then multiply 60 and 5.