Sixteen is the same as one and two-tenths times a number added to negative 8
2 answers:
Answer:
20
Step-by-step explanation:
⇔ We can set up an equation using the information given to us
We can that 16 is equal or the same as, one and two tenths times a number which is 'x' added to negative 8
⇔ The minus cancels out the plus
⇔ Add 8 to both sides to isolate
⇔ Convert to improper fraction to make solving easier
⇔ Multiply both sides by 10 to isolate 12x
240 = 12x
⇔ Divide both sides by 12 to isolate x
20 = x
→ The 'number' is 20
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Answer:
She drove 8 miles each day.
Step-by-step explanation:
Given that she drove equal number of miles in 5 days. So in order to find the number of miles in each days, you have to divide it by 5,
Answer:
26 ft square by 13 ft high
Step-by-step explanation:
The tank will have minimum surface area when opposite sides have the same total area as the square bottom. That is, their height is half their width. This makes the tank half a cube. Said cube would have a volume of ...
2·(8788 ft^3) = (26 ft)^3
The square bottom of the tank is 26 ft square, and its height is 13 ft.
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<em>Solution using derivatives</em>
If x is the side length of the square bottom, the height is 8788/x^2 and the area is ...
x^2 + 4x(8788/x^2) = x^2 +35152/x
The derivative of this is zero when area is minimized:
2x -35152/x^2 = 0
x^3 = 17576 = 26^3 . . . . . multiply by x^2/2, add 17576
x = 26
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As the attached graph shows, a graphing calculator can also provide the solution.
