Answer:
A.130 stamps after 3 months
B. The number of stamps Gracie added to her collection in 2 months is 100
Step-by-step explanation:
Mark me brainliest plzzzzzzzzzzzzzzzz
Answer:
x=2, y= 4
Step-by-step explanation:
Equation 1 is 2x-4y = -12
Equation 2 is 2x+y = 8
Subtracting the two equations gives -4y-y = -12-8 (The 2x and the other 2x cancel each other out).
Simplifying we get -5y = -20 and y =4
Substituting y =4 into original equation back we get 2x -4(4) =-12
This equals 2x -16 =-12 and 2x = 4 and x =2
Answer:
I'm not 100%sure but I think it's-7
Answer:
PR
Step-by-step explanation:
They're congruent, so corresponding sides of corresponding congruent figures are congruent. A corresponds to P and C corresponds to R, so AC is congruent to PR
Answer:
The z-distribution should be used for this problem.
Step-by-step explanation:
The population distribution is assumed to be normal. Which distribution to use?
If we have the standard deviation for the sample, we use the t-distribution.
If we use the standard deviation for the population, we use the z-distribution.
There is a known standard deviation of 2.2 minutes.
This means that 2.2 is the population standard deviation, and thus, the z-distribution should be used for this problem.
