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2 years ago

HELP please I need to finish khan ASAP!

Mathematics

2 answers:

Aloiza [94]2 years ago

8 0

Answer:

Step 2

Step-by-step explanation:

here are the steps to 8d=72

$\frac{8d}{8}$ = $\frac{72}{8}$

d = 9

Derek did step to wrong because he divided wrong. 72/8 is <em>not</em> 8.

its 9.

therefore Derek did step 2 is wrong

answer: step 2

hope this helps! ;)

jeka942 years ago

7 0

Answer:

step 2

Step-by-step explanation:

72/8 does not equal 8. It equals 9

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Answer:

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A circular flower bed is 24m in diameter and has a circular sidewalk around it that is 2m wide. Find the area of the sidewalk in

sp2606 [1]

Answer:

163.3m²

Step-by-step explanation:

area = Pi(r²)

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1 year ago

In a triangle ABC, A= 29°, B=36° and b=15.8cm. Find a, using sine rule.

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2 years ago

A thermometer is taken from a room where the temperature is 20°C to the outdoors, where the temperature is 3°C. After one minute

IrinaVladis [17]

Answer:

A. T=7.12°C; B. t=3.32min

Step-by-step explanation:

In order to find the answer we can use the Newton's law of cooling:

$y(t)=y0e^{kt}$ where:

y0=initial temperature - room temperature

k=coefficients

t=time

Because the outdoors temperature is 3°C, the initial temperature is 20°C, and because the thermometer reads 11°C after 1min we have:

$11=(20-3)e^{k*1}$

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$y(2)=17e^{-0.4353*2}$

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B. Time in order to read 4°C

$4=17e^{-0.4353*t}$

$ln(4/17)/(-0.4353)=t}$

$3.32min=t$

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2 years ago