Answer:
a. it has no solution
b. you can only substitute by making either the 'x' or 'y' the subject of either of the two equations.
Step-by-step explanation:
3x - 9y = -13.............. eqn 1
x - 3y = -7................... eqn 2
from eqn 2
x - 3y = -7, substitute by making 'x' the subject
x = -7 + 3y.................. eqn 3
put eqn 3 into eqn 1
3x - 9y = -13
3( -7 + 3y) - 9y = -13
-21 + 9y - 9y = -13
9y - 9y = -13 + 21
0 = 8, which is not possible.
Answer:6000
Step-by-step explanation:3 quarters is equal to 9/12. And 1/3 is equal to 4/12
If it is 9/12 full and 2500 gallons are drained then there are 4/3 left
9/12 - 4/3 is equal to 5/12.
Thta means 2500 gallons is 5/12 of the whole container
5/12 divided by 5 is 1/12
And 2500 divided by 5 is 500
That means every 1/12 of the container can fill 500 gallons
Do then 500 times 12 is 6000
Sorry I am really bad at explaining
Answer:
96/4= g or 4g=96
Step-by-step explanation:
Everyone will get 24 grapes
It is less than 20 km, because 20 km is equal to 20000 m
Answer: 0.0010
Step-by-step explanation:
Given the following :
Population Mean(m) = 4.2 years
Sample mean (s) = 3.9
Standard deviation (sd) = 0.6
Number of samples (n) = 38
Calculate the test statistic (z) :
(sample mean - population mean) / (sd / √n)
Z = (3.9 - 4.2) / (0.6 / √38)
Z = (- 0.3) / (0.6 / 6.1644140)
Z = -0.3 / 0.0973328
Z = - 3.0822086
Z = - 3.08
From the z table :
P(Z ≤ - 3.08) = 0.0010