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givi [52]
3 years ago
15

Help me with this please

Mathematics
1 answer:
babymother [125]3 years ago
3 0

Answer:

When w = 8, w² - 4w - 2 = 30.

Step-by-step explanation:

w² - 4w - 2

Substitute value w = 8.

8² - 4(8) - 2

Square 8.

64 - 4(8) - 2

Multiply -4 and 8.

64 - 32 - 2

Subtract 32 from 64.

32 - 2

Subtract 2 from 32.

30.

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Which graph represents a proportional relationship .
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Answer:

Answer choice C

Step-by-step explanation:

This is the only graph which has a linear equation and starts from 0,0.

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3 years ago
Using six random samples, the average number of catfish in the samples was 5.7. If the total population of fish in the pond is 2
lutik1710 [3]

Answer:10

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
2. Solve the following system of equations. y = 5 + x 2x + 2y = 30
larisa86 [58]
X = 5

since we know y= 5 + x , plug this into y in the second equation.

2x + 2 (5 + x) = 30

distribute 2 into the 5 and x

2x + 10 + 2x = 30

combine like terms

4x + 10 = 30

subtract 10 from both sides

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divide four by both sides to isolate the variable

x = 5
5 0
3 years ago
Read 2 more answers
Evaluate... k/2 + 9 = 30
Simora [160]

Answer:

K = 42

Step-by-step explanation:

K/2 = 21

2* k/2 =2*21

k=42

4 0
4 years ago
Read 2 more answers
Saline solution A is 10% strength and saline solution B is 5% strength. I have an order for 6 litres of an 8% saline solution. T
kupik [55]
Let x = volume of saline solution A,
y = volume of saline solution B.

We're going to set up two equations. 
Firstly, x + y = 6. That gives us y = 6 – x     (1)

Second, 0.1x + 0.05y = 0.08•6, 
or 0.1x + 0.05y = 0.48               (2)

Substitute (1) into (2):
0.1x + 0.05(6 – x) = 0.48
0.1x + 0.3 – 0.05x = 0.48
0.05x + 0.3 = 0.48

Subtract 0.3 from both sides:
0.05x = 0.18
x = 3.6
Then y = 6 – 3.6 = 2.4

So we have to use 3.6 litres of solution A and 2.4 litres of solution B.


7 0
3 years ago
Read 2 more answers
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