PLEASE HELP! Bob's Bricks has determined that a brick measuring 5 inches long has a z-score of +1 and a brick measuring 5.75 inches long has a z-score of +2.

What is the mean length of the bricks produced at Bob's Bricks?

A.4.00 inches
B. 4.25 inches
C. 4.75 inches
D. 5.25 inches

First, let's calculate the standard deviation of the bricks.

Standard deviation = 5.75 - 5 = 0.75

Now, we need to use the z-score formula to calculate the mean.

z-score = (observed value - mean) / standard deviation.

Let's plug our values into the formula above.

1 = (5 - mean) / 0.75

Multiply both sides by 0.75

0.75 = 5 - mean

Subtract 5 from both sides.

-4.25 = -mean

Divide both sides by -1

4.25 inches = mean

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

98%

step-by-step explanation: