I think the correct answer is b
Answer:

Exponential decay
Step-by-step explanation:
We are given that

y=20 when t=0

Taking integration on both sides then we get

Using formula

Using formula




Substitute y=20 and t=0

Substitute the value of C

When t tends to infinity then

When time increases then the value of function decrease
Hence, the function is exponential decay.
Answer:
<XWZ is a right angle
Step-by-step explanation:
Since <YWZ and <XWY both equal 45 degrees, So, <XWZ is a right angle.
Solution:
We are given that lena sells cosmetics and recieves commissions of 45%.
She sold $200 worth of cosmetics to one customer.
It mean she will get a commission of 45% on $200. So we will find 45% of 200 and the resulting value will be the comission of Lens.
45% of 200
Comission recieved
It mean that when leena sells cosmetics of $200, she gets a comission of $90.
I think its 243.3 (the 3 is a repeating decimal)