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3 years ago

In right triangle ABC, ∠A and ∠B are complementary angles and sin A = . What is cos B?

Mathematics

2 answers:

Musya8 [376]3 years ago

4 0

Answer:

PLATO!!!!!

The correct answer is B. 8/9.

hodyreva [135]3 years ago

3 0

Answer:

Step-by-step explanation:

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2.8x = -9.24 <br>A. 12.04<br>B. -0.3030<br>C. 12.04<br>D. -3.3

Hunter-Best [27]

Answer:

D. -3.3

Step-by-step explanation:

=> 2.8x = -9.24

=> x = -9.24/2.8

=> x = -3.3

5 0

3 years ago

Read 2 more answers

(a) What is the rate of change for each function? Show your work.

ikadub [295]

First. You have to look at what kind of proportionality it is.It is an Inverse Proportion.so you see the rate of change is 2.3

7 0

3 years ago

At the beginning of an experiment, a scientist has 300 grams of radioactive goo. After 150 minutes, her sample has decayed to 37

monitta

Answer:

Half-life of the goo is 49.5 minutes

$G(t)= 300e^{-0.014t}$

191.7 grams of goo will remain after 32 minutes

Step-by-step explanation:

Let $M_0\,,\,M_f$ denotes initial and final mass.

$M_0=300\,\,grams\,,\,M_f=37.5\,\,grams$

According to exponential decay,

$\ln \left ( \frac{M_f}{M_0} \right )=-kt$

Here, t denotes time and k denotes decay constant.

$\ln \left ( \frac{M_f}{M_0} \right )=-kt\\\ln \left ( \frac{37.5}{300} \right )=-k(150)\\-2.079=-k(150)\\k=\frac{2.079}{150}=0.014$

So, half-life of the goo in minutes is calculated as follows:

$\ln \left ( \frac{50}{100} \right )=-kt\\\ln \left ( \frac{50}{100} \right )=-(0.014)t\\t=\frac{-0.693}{-0.014}=49.5\,\,minutes$

Half-life of the goo is 49.5 minutes

$\ln \left ( \frac{M_f}{M_0} \right )=-kt\Rightarrow M_f=M_0e^{-kt}$

So,

$G(t)= M_f=M_0e^{-kt}$

Put $M_0=300\,\,grams\,,\,k=0.014$

$G(t)= 300e^{-0.014t}$

Put t = 32 minutes

$G(32)= 300e^{-0.014(32)}=300e^{-0.448}=191.7\,\,grams$

7 0

3 years ago

What are the x-intercepts of the graphed function?

KATRIN_1 [288]

Answer:

(1,0) and (-3,0)

Step-by-step explanation:

It is because at those points on the graph is where the graphed function crossed the x-axis.

4 0

3 years ago

$274 for 40 hours of work as a unit rate

vazorg [7]

Answer:

<h2><u><em>6.85 units per hour</em></u></h2>

Step-by-step explanation:

$274 for 40 hours of work as a unit rate

in practice you look for the hourly wage, you find it by dividing the wages divided by the working hours

274 : 40 = 6.85 units per hour

4 0

2 years ago