Answer:
The answer would be B. 12 + 6n is greater than or equal to 30, so n is less than or equal to 3.
explanation:
I'm bad with explaining things, but I'll try my best to explain why this is the right answer.
12 + 6n ≥ 30, so n ≤ 3
let's start with the 12 at the beginning of the inequality, Annie already has $12, so the 12 in the inequality shows the amount of money she already has being added to the $6 per hour of babysitting she needs to do (n).
Now for the + 6n, the plus is there to show that the $12 Annie already has is being added to the 6n. The 6n then represents the $6 Annie makes each hour and the n represents how many hours she needs to babysit in order to get $30. The 6 is being multiplied by the amount of hours she needs to babysit to show how much money Annie would make. Then you add on the $12 she already has.
Annie then needs at least $30, but if she makes more than $30 then she will simply have more money than needed, therefore you use the greater than or equal to sign to show that she can have more money than just $30 after working.
I hope this helps, and sorry if my explanation is hard to understand lol.
Answer:
y=4x+9
Step-by-step explanation:
Slope-intercept form is y=mx+b where m is the slope, and b is the y-intercept. Given the numbers, for both, you can plug them in and get the equation y=4x+9.
Answer:
192 pounds of $2.5 brand
288 pounds of $2.8 brand
Step-by-step explanation:
From the information we can write an expression that relates the two brands the total pounds of coffee the grocer wants to see. Let x be pounds of the coffee brand 1 and y be pounds of the coffee brand 2.Equation 1:
![480=x+y](https://tex.z-dn.net/?f=480%3Dx%2By)
We know that the price of will be equation 2:
![480*2.68=2.5*x+2.8*y](https://tex.z-dn.net/?f=480%2A2.68%3D2.5%2Ax%2B2.8%2Ay)
Two equations and two unknowns we can solve for x and y:
![x=480-y](https://tex.z-dn.net/?f=x%3D480-y)
Substitute into the second equation:
![480*2.68=2.5*(480-y)+2.8*y](https://tex.z-dn.net/?f=480%2A2.68%3D2.5%2A%28480-y%29%2B2.8%2Ay)
![1286.4=1200-2.5*y+2.8*y](https://tex.z-dn.net/?f=1286.4%3D1200-2.5%2Ay%2B2.8%2Ay)
![y=86.4/0.3=288](https://tex.z-dn.net/?f=y%3D86.4%2F0.3%3D288)
Therefore he uses 288 pounds of brand two at $2.80 and 480-288=192 pounds of brand 1 at $2.50
Answer:
A
Step-by-step explanation:
X is a right angle, so it is equal to 90 degrees. because angle C is 54 degrees, 90 degrees and 54 degrees are added. Then, you subtract the total of those two numbers (144) from 180, and get 36 degrees. In conclusion, x=90 and y=36