Let n = number of records.
Each record costs $7, so n records cost 7n.
She then spent $3, so the total spent is 3n + 3.
She spent a total of $24, so 3n + 3 must equal 24. That gives us the following equation.
7n + 3 = 24
Subtract 3 from both sides.
7n = 21
Divide both sides by 7.
n = 3
Answer: She bought 3 records.
4:1 is the answer............
Area of trapezium=384 square cm
Ratio of parallel sides=
Distance between parallel sides=h=12 cm
Answer:
c. new Orleans is closer to sea level than salton trough.
Step-by-step explanation:
this is because sea level is 0 ft. new Orleans is 2 feet away from sea level so it is closer to sea level than salton trough which is 69 feet away from sea level.
Answer:
Step-by-step explanation:
Given
Required
The dimension that minimizes the cost
The volume is:
This gives:
Substitute
Make H the subject
The surface area is:
Area = Area of Bottom + Area of Sides
So, we have:
The cost is:
Substitute: and
To minimize the cost, we differentiate
Then set to 0
Rewrite as:
Divide both sides by W
Rewrite as:
Solve for 
Take cube roots
Recall that:
Hence, the dimension that minimizes the cost is:
