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pickupchik [31]
2 years ago
13

What is 15% of 90? ..............​

Mathematics
2 answers:
mars1129 [50]2 years ago
7 0

Answer:

13.5

hope it helpeddddd

:P

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
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