Lúcia is using energy at a rate of 420420420 kilocalories (\text{kcal})(kcal)left parenthesis, start text, k, c, a, l, end text, right parenthesis per hour (\text{h})(h)left parenthesis, start text, h, end text, right parenthesis ice skating. At what rate is Lúcia using energy in calories per minute \left(\dfrac{\text{cal}}{\text{min} }\right)(
min
cal

)left parenthesis, start fraction, start text, c, a, l, end text, divided by, start text, m, i, n, end text, end fraction, right parenthesis?

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Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )

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