Answer:
If two triangles Δ RST and Δ XYZ are similar, then corresponding angles are equal and their corresponding sides are proportional.
So here ∠R=∠X, ∠S=∠T and ∠T=∠Z
The number of stamps and the cost are illustrations of unit rates
40 stamps would cost $22
The cost of 15 postage stamps is $8.25
Start by calculating the unit rate of the stamps.


So, the number of stamps for $22 is calculated by dividing $22 by the unit rate.
So, we have:


Hence, 40 stamps would cost $22
Read more about unit rates at:
brainly.com/question/396443
Answer:
+5
Step-by-step explanation:
Let's analyze the sine function first:

we know that this is periodic function with values between -1 and 1.
Now let's consider the function of the problem

Here we have basically multiplied the previous function by a constant number, -5. Therefore, we have:
- when 
- when 
So, the values of the function

are between -5 and +5, and so its maximum value is +5.
297 I think because 45+21=66, then x9= 594 divided by 2 is 297
10,000/100 = 100 x 4.50 = 450
therefore you would earn %450 in interest after one year