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Leno4ka [110]
3 years ago
12

alica and jeremy weigh a cell phone on a digital scale. they wrote down 113 but forget to record the unit.Which unit of measurem

ent is correct, grams or kilograms? how do you know?
Mathematics
1 answer:
marshall27 [118]3 years ago
6 0
I'm sure the measurement was made in grams because:

1. most cell phones weigh between about 100 and 150 grams
2. there's no cell phone that weighs 113 kg, 113 pounds, 113 ounces etc.
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It would be 4/16, so the answer is 1/4.
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Identify the area of a regular decagon with side length 2 m rounded to the nearest tenth
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Answer:

Area = 14.8

Step-by-step explanation:

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This formula given the side length, calculates the area.

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Step-by-step explanation:

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What is the range, min, and max of the function f(x)=13-20x-x²-3x⁴
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Step-by-step explanation:

I found these using a graphing calculator. (See attached)

The function is a polynomial of 4th degree with a negative leading coefficient. (The coefficient of the 4th-degree term is -3.) Therefore, it opens downward and has a range that extends to -∞. This function only has one global maximum and no local minimum.

_____

The maximum can be found by solving the cubic equation that results from taking the derivative of this function and finding the root of that:

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  g(x) = 6x^3 +x +10

The one real zero of it can be found using Newton's Method iteration.

The Newton's Method iterator function is

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where g'(x) is the derivative of g(x), often available as a function on the graphing calculator.

The starting value for the iteration can be the x-value obtained from the graph: -1.139. It only takes about 2 or 3 iterations to find x to the precision of the calculator: x = h(h(x)). This x is the x-coordinate of the maximum, so f(x) is the maximum value: 29.4335546516.

__

The attachments show the function definitions and their use for finding the maximum of f(x) using a TI-84 calculator. Y₁ is the function f(x); Y₂ is its derivative, shown above as g(x). Y₃ is the iterating function, shown above as h(x). The nDeriv( ) function is a calculator function that finds the numerical derivative of its argument.

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