Because x,y,z form a geometric sequence, therefore the common ratio is
r = y/x = z/y
That is,
y² = xz (1)
We are given:
x + y + z = 18
Therefore
x + z = 18 - y (2)
Also,
x² + y² + z² = 612
Therefore, from (1), obtain
x² + z² + xz = 612
(x + z)² - xz = 612
From (1) and (2), obtain
(18 - y)² - y² = 612
324 - 36y + y² - y² = 612
-36y = 288
y = -8
Answer: y = -8
We have the formula: (y+4)/(-2+4) = (x+2)/(3+2);
Then, (y+4)/2 = (x+2)/5;
y+4 = (2/5)(x+2); / - 2
y+2 =(2x)/5 + 4/5 - 2;
y + 2 = (2x)/5 - 6/5;
y + 2 = (2/5)(x - 3) is the equation of the line;
Answer:
The average number of pounds they bought was 30 pounds.
Step-by-step explanation:
we know that
To find out the average number of pounds, add the total number of pounds for each boy and then divide by the number of boys.
so

therefore
The average number of pounds they bought was 30 pounds.
Answer:
8365431.2
Step-by-step explanation:
you will multiply 2987654 * the square root of 8 which is equal to at least 2.8 (that is rounding of course)=8365431.2
Well, it says to use a calculator to calculate them. So a calculator I would highly recommend is the Desmos graphing calculator.