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2 years ago

Help mathh PLEAEE HELP

Mathematics

1 answer:

Bess [88]2 years ago

8 0

this is as far as i could get. sorry

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Tell whether the ordered pair is a solution to the equation.<br><br><br> (1, 3); 4x – 3y = -5

Bumek [7]

Answer:

Yes

Step-by-step explanation:

4(1)-3(3)=-5

4-9=-5

-5=-5

8 0

2 years ago

Help me asap the questions are in the screenshot

Strike441 [17]

Answer:

where is the screenshot? I cant see it

Step-by-step explanation:

4 0

2 years ago

Each year on the same day, Hasan deposits $150 in a saving account that earns simple interest at an annual rate of 3%. He makes

Fittoniya [83]

Answer:$4.5

Step-by-step explanation:

Simple interest = PRT/100

Simple interest = 150*3*1/100

Simple interest = 450/100

Simple interest =$4.5

7 0

3 years ago

When a cold drink is taken from a refrigerator, its temperature is 5 degrees C. After 25 minutes in a 20 degrees C room its temp

Leto [7]

Using Newton's Law of Cooling, $\dfrac{dT}{dt} = k(T-T_s)$ , we have $\dfrac{dT}{dt} = k(T - 20)$ ( $T_s$ is 20 degrees). Letting $y = T - 20$ , we get $\dfrac{dy}{dt} = ky$ , so $y(t) = y(0)e^{kt}$ . $y(0) = T(0) - 20 = 5-20 = -15$ , so $y(25) = y(0) e^{25k} = -15e^{25k}$ , and $y(25) = T(25) - 20 = 10 - 20 = -10$ so $-15e^{25k} = -10 \ \ \Rightarrow \ \ e^{25k} = \frac{2}{3}$ . Thus, $25k = \ln\left(\frac{2}{3}\right)$ and $k = \frac{1}{25} \ln\left(\frac{2}{3}\right)$ , so $y(t) = y(0)e^{kt} = -15e^{(1/25)\ln(2/3)t}$ . More simply,
$e^{25k} = \frac{2}{3} \ \ \Rightarrow \ \ e^k = \left( \frac{2}{3} \right)^{1/25}\\ \Rightarrow \ \ e^{kt} = \left( \frac{2}{3} \right)^{t/25}\\
\Rightarrow y(t) = -15 \cdot \left( \frac{2}{3}\right)^{t/25}$

(a) $T(50) = 20 + y(50) = 20-15 \cdot \left( \frac{2}{3}\right)^{50/25}$ =
$20 - 15 \cdot\left(\frac{2}{3}\right)^2 = 20 - \frac{20}{3} = 13.\overline{3}{}^{\circ}C$

13.33333 °C

(b) $15 = T(t) = 20 + y(t) = 20 - 15\cdot\left( \frac{2}{3} \right)^{t/15}$
$\Rightarrow 15 \cdot \left(\frac{2}{3}\right)^{t/25} = 5 \Rightarrow \left( \frac{2}{3} \right)^{t/25} = \frac{1}{3} \Rightarrow$
$(t/25) \ln\left( \frac{2}{3}\right) = \ln\left( \frac{1}{3}\right) \rightarrow t = 25 \ln\left( \frac{1}{3}\right) / \ln\left( \frac{2}{3}\right) \approx 67.74\text{ min}$

67.74 min

4 0

2 years ago

4² − 7 + 55 − 74 + 3 (Ascending with respect to n):

Zarrin [17]

Answer:

If its supposed to be simplify it will be -7 . If your finding the derivative it is 0.

Step-by-step explanation:

5 0

2 years ago

Help mathh PLEAEE HELP​

Help mathh PLEAEE HELP