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Alenkasestr [34]

2 years ago

10

Calculate 20% of R400

1 answer:

Zinaida [17]2 years ago

6 0

Answer:

<h2><u><em>80</em></u></h2>

Step-by-step explanation:

400: 100 you find 1% you multiply it by 20 and you have 20%

400 : 100 * 20 =

4 * 20 =

<h2><u><em>80</em></u></h2>

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Solve equation by using the quadratic formula.<br> 2x2 + 13x = 0

Nadusha1986 [10]

THE answer is 17 because 2X2= 4+13= 17
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3 years ago

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ArbitrLikvidat [17]

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2 years ago

After heating up in a teapot, a cup of hot water is poured at a temperature of 204°F.

laila [671]

Answer:

Question 1: 0.081 min⁻¹

Question 2: 168ºF

Explanation:

The missing equation is:

$T=T_a+(T_0-T_a)e^{-kt}$

You are given:

Ta = the temperature surrounding the object = 73ºF
T₀ = the initial temperature of the object = 204ºF
t = 2.5 min
T after 2.5 min = 180ºF

Question 1: Find the the value of k.

Substitute the data into the equation and solve for k:

$180\º=73\º+(204\º-73\º)e^{-k\cdot 2.5min}\\ \\ 107\º=131\ºe^{-k\cdot 2.5min}\\\\-k\cdot 2.5min=\ln (107/131)\\\\k=0.081min^{-1}$

Question 2: Find the Fahrenheit temperature of the cup of water, to the nearest degree, after 4 minutes.

Subsititute into the formula and compute:

$T=73\ºF+(204\ºF-73\ºF)e^{-0.081min^{-1}\times 4min}\\ \\ T=73\ºF+(131\ºF)(0.72325024)\\\\T=168\ºF$

4 0

3 years ago

Help within 10 min pleeeeeeeeeease

sineoko [7]

The answer should be 75

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2 years ago

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Somebody help please !!!!

Alecsey [184]

Answer:

A

Step-by-step explanation:

y is -6 = y-6

x=2 so =x+2

slope is -3/4

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3 years ago