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janeou17xn
26.06.2019 •
Mathematics
Acandle burned at a steady rate. after 34 minutes, the candle was 11.2 inches tall. eighteen minutes later, it as 10.75 inches tall. use and equation in point-slope form to determine the height of the candle after 2 hours. round the answer to the tenth place if necessary. after 2 hours, the candle will be how many inches tall?
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Ответ:
y = length, inches
When x = 32 min, y = 11.2 in
When x = 32+18 = 50, y = 10.75 in
Assume that a linear relatioship exists between x and y.
In table form, the given data is
x, min: 32 50
y, in: 11.2 10.75
The slope is
m = (10.75 - 11.2)/(50 - 32) = -0.025
In point-slope form, the required equation is
When x = 3 hours = 180 minutes, obtain
y - 10.75 = -0.025*(180 - 50) = -3.25
y = -3.25 + 10.75 = 7.5 in
7.5 inches
Ответ:
44
Step-by-step explanation:
h(x) = x² - 5
h(-7) = (-7)² - 5 = 49 - 5 = 44