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Mrrafil [7]
3 years ago
8

From the beginning of the day the temperature rose 15° so that by 4 pm it was 87°. What was the temperature at the start of the

day?
A) 72°
B) 77°
C) 82°
D) 102°
Mathematics
1 answer:
Stolb23 [73]3 years ago
6 0

Answer:

72 degrees

Step-by-step explanation:

the temperature rose 15, and ended as 87, so the temp was 72 before it rose

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Gnoma [55]

x-intercepts are points of the form (x, 0), and y-intercepts are points of the form (0, y).

You find the x-intercepts by solving for x such that y = f(x) = 0:

x^3-9x^2+20x-12=0

You know x - 6 is a factor of f(x), which means x = 6 is a solution to the above equation, and that means that (6, 0) is one x-intercept.

You can find the other two by dividing f(x) by x - 6 (i.e. further factorizing f(x)).

\dfrac{x^3-9x^2+20x-12}{x-6}=x^2-3x+2=(x-2)(x-1)

So we have

x^3-9x^2+20x-12=(x-6)(x-2)(x-1)=0\implies x=6,x=2,x=1

and this means the x-intercepts are (6, 0), (2, 0) and (1, 0).

The y-intercept is easier to find; set x = 0, then solve for y = f(0):

y=0^3-9\cdot0^2+20\cdot0-12=-12

and so the y-intercept is (0, -12).

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3 years ago
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Answer:

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Step-by-step explanation:

3) 6.35

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2 years ago
10 day moving average
Lana71 [14]
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2 years ago
If the basalt at the top of the ancient valley below Vulcan's Throne yields a radiometric date (K-Ar) of 15,000 years, and the l
zepelin [54]

Answer:

1.69\times 10^3feet/million year

Step-by-step explanation:

We are given that

Elevation of top of basalt in valley =4100 feet

Elevation of bottom of basalt in valley =2100 feet

Age of top of basalt in valley=15000 years

Age of bottom of basalt in valley=1.2 million years=1.2\times 10^6 years=1200000 years

We have to find the rate of basalt filling in the valley in feet per million yeas

Rate of basalt filling in the valley=\frac{Elevation\;of\;top\;of\;basalt\;in\;valley-elevation\;of\;bottom\;of\;basalt\;in\;valley}{age\;of\;bottom\;of\;basalt\;in\;valley-age\;of\;top\;of\;basalt\;in\;valley}

Rate of basalt filling in the valley=\frac{4100-2100}{1200000-15000}=\frac{2000}{1185000}=1.69\times 10^{-3} feet/year

Rate of basalt filling in the valley=1.69\times 10^{-3}\times 10^{6}=1.69\times 10^3feet/million year

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Factor the expression<br><br> 20k + 50
andre [41]
20050 is you answer

Hope This Helps
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3 years ago
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