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slamgirl [31]
3 years ago
13

Evaluate 2x - y + 4z, if x = 1, y = 2 and z = -1

Mathematics
1 answer:
lidiya [134]3 years ago
5 0

2 x 1 - 2 + 4 x -1 =

the answer is -4.

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CHCK Farms raises hens and roosters. They have enough space to raise at most 300 birds per year. Each hen eats 80 pounds of food
svp [43]

<u>Answer</u>:

The number of hens is 100 and the number of roosters is 200.

<u>Step-by-step explanation:</u>

Let the number of hens be x and the number of roosters be y

then the total number of  hens and roosters, is 300

so,

x+y \leq 300----------------------------(1)

Also  the hen eats 80 pounds of food per year and roosters eats 60 pounds of food per year,

80x+60y \leq 20000----------------(2)

To solve the equations , multilpy eq(1) by 80

80x+80y \leq 24000------------------(3)

Subracting (2) from (3)

20y \leq 4000

y \leq 200

substituting y in eq(1) we get

x+200 \leq 300

x \leq 300-200

x \leq 100

7 0
3 years ago
Work out the shaded area​
Dennis_Churaev [7]

Answer:

<h2> 70 {cm}^{2}</h2>

Step-by-step explanation:

Shaded area:

Area of big rectangle - Area of small rectangle

= 10 \times 12 - (10 - 5) \times (12 - 2)

Calculate the difference

= 10  \times 12 - 5 \times 10

Calculate the product

= 120 - 50

Calculate the difference

= 70 \:  {cm}^{2}

Hope this helps...

Best regards!!

7 0
3 years ago
Which expression represents a negative number?
lina2011 [118]

Its C.

Negative x Negative is positive, so its not A or D.

Positive x Positive is Positive, so its not B either.

C is your option because Positive x Negative is Negative, and vice verca.

6 0
2 years ago
Read 2 more answers
Help this question is due in like 15 minutes :p
fomenos

Answer:

A= 150°

B=30°

C=150°

Step-by-step explanation:

Since a line is 180°, you can write an equation for C. C+30°=180° , from here use algebra to find C. The value of C will be 150°. When the value of C is 150° , since they're supplementary angles, the value of A will also be 150°.

Important thing to note:

The value of all these angles combined together is 360°.

5 0
2 years ago
This table represents Jennifer's check register. Her checking account had a balance of $2,322.75 on April 24.
TEA [102]

Answer:

im on the same question and i dont know ‍

6 0
2 years ago
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