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2 years ago

13

fancy goldfish x cost $3 each and common goldfish y cost $1 Graph tje function y=20-3x determine how many of each type of goldfi

sh Tasha can by 20

1 answer:

NemiM [27]2 years ago

4 0

6 Fancy, and 20 Common

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Marty earns $24 per hour. Marissa earns a base weekly salary of $100 plus $8 per hour. How long will Marty and Marissa have to w

vaieri [72.5K]

I think the answer is c. please tell me if i am right

4 0

3 years ago

Read 2 more answers

Find the solution to this system of equations <br> 3x+2y+3z=3 4x-5y+7z=1 2x+3y-2z=6 <br> x=? Y=? Z=?

Ede4ka [16]

Answer:

The solution is $x=2,\ y=0,\ z=-1.$

Step-by-step explanation:

You are given the system of three equations:

$\left\{\begin{array}{l}3x+2y+3z=3\\4x-5y+7z=1\\2x+3y-2z=6\end{array}\right.$

Multiply the first equation by 4, the second equation by 3 and subtract them. Then multiply the third equation by 2 and subtract it from the second equation:

$\left\{\begin{array}{l}3x+2y+3z=3\\4(3x+2y+3z)-3(4x-5y+7z)=4\cdot 3-3\cdot 1\\4x-5y+7z-2(2x+3y-2z)=1-2\cdot 6\end{array}\right.\Rightarrow \\\\\left\{\begin{array}{l}3x+2y+3z=3\\12x+8y+12z-12x+15y-21z=12-3\\4x-5y+7z-4x-6y+4z=1-12\end{array}\right.$

So,

$\left\{\begin{array}{rl}3x+2y+3z=3\\23y-9z=9\\-11y+11z=-11\end{array}\right.\Rightarrow \left\{\begin{array}{l}3x+2y+3z=3\\23y-9z=9\\y-z=1\end{array}\right.$

Multiply the third equation by 23 and subtract it from the second equation:

$\left\{\begin{array}{rl}3x+2y+3z=3\\23y-9z=9\\23y-9z-23(y-z)=9-23\cdot 1\end{array}\right.\Rightarrow \left\{\begin{array}{rl}3x+2y+3z=3\\23y-9z=9\\23y-9z-23y+23z=9-23 \end{array}\right.$

Hence,

$\left\{\begin{array}{rl}3x+2y+3z=3\\23y-9z=9\\14z=-14 \end{array}\right.\Rightarrow z=-1$

Substitute it into the second equation:

$23y-9\cdot (-1)=9\Rightarrow 23y+9=9\\ \\23y=0\\ \\y=0$

Substitute them into the first equation:

$3x+2\cdot 0+3\cdot (-1)=3\Rightarrow 3x-3=3\\ \\3x=6\\ \\x=2$

The solution is $x=2,\ y=0,\ z=-1.$

3 0

3 years ago

A recipe calls 1/5 teaspoon of baking powder. If the recipe is tripled, how much baking

sergeinik [125]

Answer:

0.6 tsp

Step-by-step explanation:

To triple a number, multiply it by 3.

1/5 tsp × 3 = 0.6 tsp

8 0

2 years ago

HELP WILL GIVE BRAINLIST!! ONLY 1 QUESTION!!!

Annette [7]

Answer:

an inch

Step-by-step explanation:

i mean. think about it. if u had it, ud just do one inch. did they say it had to be even? NO. so...

5 0

2 years ago

I need Help with this TRIG question

strojnjashka [21]

x
(15) sin 30.5   = ------ (15)
     15

(15) sin 30.5 = x
Plug this part into a calculator.

7.61 = x

Area of a triangle: 1/2bh

1/2 (7.61)(13)
3.805(13)
49.469

49.47 un² is your final answer since you are supposed to round to the tenths place. I hope this helps.

3 0

2 years ago