Ask question

Ask question

All categories

3 years ago

10

A building as the window made of square glass blocks each block has an area of one square foot. What is the side length of the u

nits Square?

1 answer:

Karolina [17]3 years ago

5 0

144 in all the way around

You might be interested in

To get ready for the big community bake sale a baker is baking cookies.For his first batch he makes 48 cookies second 78 cookies

mina [271]

Answer:

62

Step-by-step explanation:

To find the mean, add the numbers together and divide the sum by the total amount of numbers.

$\frac{48+78+54+68}{4} =62$

6 0

3 years ago

Which point is collinear to the point (0,0)?<br><br>A) (1,0)<br>B) (3,2)<br>C) (4,1)<br>D) (1,3)

Sonbull [250]

Answer:

All of them are right

Step-by-step explanation:

Are you sure the question was that?

Collinear means that it lies on the same line

Now, from every 2 points passes a unique line

So(0,0) and (3,2) are in a line

(0,0) and (1,0) are in an other line and so on

8 0

3 years ago

You can read 20 pages in 45 minutes. how many pages can you read in 1 minute

butalik [34]

Answer:

enough to process what a word is

Step-by-step explanation:

8 0

3 years ago

Find the product.<br> (3n - 1)(7n-7)

slega [8]

Answer:

21n² - 28n + 7

Step-by-step explanation:

Each term in the second factor is multiplied by each term in the first factor, that is

3n(7n - 7) - 1(7n - 7) ← distribute both parenthesis

= 21n² - 21n - 7n + 7 ← collect like terms

= 21n² - 28n + 7

6 0

3 years ago

Newton's law of cooling states that the temperature of an object changes at a rate proportional to the difference between its te

Aleonysh [2.5K]

Answer:

t=5.18 minute

Step-by-step explanation:

Using Newton's law of cooling

$\frac{dT}{dt}=-k(T-T_{s})$

T is temperature of a cup of coffee at any time t $T_{s}$ , is the temperature of the surrounding and k is a constant of proportionality in this negative because temperature is decreasing.

$T(0)=190\\T(1)=170\\T_{s}=66$

$\frac{dT}{dt}=-k(T-T_{s})\\\frac{dT}{(T-T_{s})}=-k*dt\\\int\limits {\frac{1}{T-T_{s} } } \, dT=-\int\limits {k} \, dt\\ln(T-T_{s})=k*t+C\\e*ln(T-T_{s})=e^{k*t+C} \\T-T_{s}=e^{k*t}*e^{C}\\e^{C}=C\\T-T_{s}=e^{k*t}*C\\T=T_{s}+e^{k*t}*C$

To find constant knowing the time and the temperature the first step of the change of energy in cup of coffee

$T=T_{s} +e^{-k*t}*C\\ C=190-66=124\\170=66+124*e^{-k*2}\\ 170-66=124*e^{-k*2}\\ln(\frac{104}{124})=ln*e^{-k*2}\\-0.175=-k*2\\k=0.08794$

Now using the constant of decreasing can find the time to be a 145 temperature the cup of coffee

$145=66+124*e^{-k*t} \\145-66=124*^{-0.087*t}$

$ln(0.637)=ln*e(-0.087*t)\\-0.45=-0.087*t\\t=5.18minutes$

4 0

3 years ago