Solve using the substitution method 3x+2y=11
X-2=4y

A(12,-5/2)
b (0,-1/2)
C (0,-2)
D (4,-1/2)

Answers

Answer 1

Answer: $\left \{ {{3x+2y=11\ \ \ \ \ \ \ } \atop {x-2y=4y\ \ | add\ 2y}} \right.\n\n \left \{ {{3x+2y=11} \atop {x=4y+2y}} \right.\n\nsubstitution\ method\n\n3(4y+2y)+2y=11\n\n3*6y+2y=11\n\n18y+2y=11\n\n20y=11\ \ \ | divide\ by\ 20\n\ny=(11)/(20)\n\nx=6y=6* (11)/(20)=(66)/(20)=(33)/(10)\n\n$

Answer 2

Answer:

I know this is already answered but this is the answer simplified

(4, -1/2)

This is to help those that didn't understand the first guys explanation.

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A cup of broth can have 870 milligrams of salt, which is 30% of the recommended daily allowance. What is the recommended daily amount?

Answers

If 870mg is 30% of recommended daily amount, then we can set up the equation:
870 = 0.30 * x (where x is the recommended amount)
870 / 0.3 = x
x = 2900mg

Therefore the recommended daily amount is 2900mg of salt

Answer:

2900 milligrams

Step-by-step explanation:

I had to do it and I got it right.

Nick read 3 pages in 1 minute. Write the ordered pairs for 0, 1, 2, and 3 minutes.

Answers

6 in 2 mins 9 for 3 mins 1 for 3 mins and 0 for 0 mins

Need help with all And have to show work

Answers

Altho' I can easily guess what you're supposed to do here, I must point out that you haven't included the instructions for this problem.

I'll help you by example. Let's look at the first problem:

"Evaluate 6(z-1) at z-4."

Due to "order of operations" rules, we must do the work inside the parentheses FIRST. Replace the z inside (z-1) with "-4". We obtain

6(-4-1) = 6(-5) = -30 (answer.)

Your turn. Try the next one. If it's unclear, as questions.

22 is 44 percent of what number

Answers

You can calculate the number of which 22 is 44 percent by using proportions. 44 percent is 44/100, so you can set that 22 / x = 44 /100., and solve for x. x = 22 * 100 / 44 = 50. Then 22 is the 44 percent of 50, which you can verify now calculating the 44 percent of 50 as 50*44/10 = 22. Answer: 22 is 44 percent of 50.

help me wit these 3 questions plz.

A cone has a base radius of 7 centimeters and a height of 21 centimeters.

What is the volume of the cone?

28π cm3

49π cm3

147π cm3

343π cm3

Answers

1. Cone

$r=7cm$
$h=21cm$

$V= (\pi*r^2*h)/(3)=(\pi*7^2*21)/(3)=7^2*7*\pi=7^3\pi=343{\pi}cm^3$

Answer: D

2. Cylinder

$r=5ft$
$h=16ft$

$V= \pi*r^2*h=\pi*5^2*16=25*16\pi=400\pi ft^3$

Answer: A

3.Pyramid

In this case it will be

$V= (a*b*h)/(3)$

$a=9ft$
$b=4ft$
$h=12ft$

$V= (4*9*12)/(3)=4*3*12=144 ft^3$

Answer: B

How would you describe the lines represented by railroad tracks?