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2 years ago

What is 15% of 90? ..............

Mathematics

2 answers:

mars1129 [50]2 years ago

7 0

Answer:

13.5

hope it helpeddddd

Step-by-step explanation:

son4ous [18]2 years ago

4 0

Answer: 13.5

Step-by-step explanation: Just divide

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Jane wishes to bake an apple pie for dessert. The baking instructions say that she should bake the pie in an oven at a constant

Viktor [21]

Answer:

Therefore $k= \frac{ln2 }{18}$ , A=184

Step-by-step explanation:

Given function is

$T(t)=230 -e^{-kt}$

where T(t) is the temperature in °C and t is time in minute and A and k are constants.

She noticed that after 18 minutes the temperature of the pie is 138°C

Putting T(t) =138°C and t= 18 minutes

$138=230 -Ae^{-k\times 18}$

$\Rightarrow -Ae^{-18k}=138-230$

$\Rightarrow Ae^{-18k}=92$ .....(1)

Again after 36 minutes it is 184°C

Putting T(t) =184°C and t= 36 minutes

$184=230-Ae^{-k\times 36}$

$\Rightarrow Ae^{-36k}=230-184$

$\Rightarrow Ae^{-36k}=46$ .......(2)

Dividing (2) by (1)

$\frac{Ae^{-36k}}{Ae^{-18k}}=\frac{46}{92}$

$\Rightarrow e^{-18k}=\frac{46}{92}$

Taking ln both sides

$ln e^{-18k}=ln\frac{46}{92}$

$\Rightarrow -18k =ln (\frac12)$

$\Rightarrow -18k= ln1-ln2$

$\Rightarrow k= \frac{ln2 }{18}$

Putting the value k in equation (1)

$Ae^{-18\frac{ln2}{18}}=92$

$\Rightarrow A e^{ln2^{-1}}=92$

$\Rightarrow A.2^{-1}=92$

$\Rightarrow \frac{A}{2}=92$

$\Rightarrow A= 92 \times 2$

⇒A= 184.

Therefore $k= \frac{ln2 }{18}$ , A=184

7 0

3 years ago

Find the value of x.

Aleks [24]

Answer:

wow why is this so hard

Step-by-step explanation:

i am in 8th grade to be honest

3 0

3 years ago

I need help on some math<br> (the ones that are circled)

vagabundo [1.1K]

Answer:

Number 7 is 34.56in

Step-by-step explanation:

First: Label each side Ex: Left side:

Top:

Bottom:

etc.

Second: Find the area of each side

Third: add them together

P.S. since this was a perfect cube, you could've also just found the area of 1 side then multiplied by 6:)

4 0

2 years ago

I don’t get this lol can someone tell me the answer ?

Sladkaya [172]

Answer:

8 miles

Step-by-step explanation:

when its 3.5hours look to the left which is 8 miles

7 0

3 years ago

Please help I’m stuck.

Sholpan [36]

What are you stuck on ??????

7 0

3 years ago

What is 15% of 90? ..............​

What is 15% of 90? ..............