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oksano4ka [1.4K]
3 years ago
9

PLEASE HELP ME I NEED THIS REALLY BAD

Mathematics
1 answer:
Galina-37 [17]3 years ago
5 0

Answer:

z=70, y=102

Step-by-step explanation:

180-110 = 70

so, z=70

99+89+70 = 258

360-258 = 102

so, y=102

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Add or Subtract to simplify
Drupady [299]

Answer:

3. - 8n² -8n + 3

Step-by-step explanation:

(4n^4 - 8n +4) - (8n² + 4n^4 +1)

Firstly, open the brackets.

= 4n^4 - 8n +4 - 8n² -  4n^4 - 1

Now, group like terms.

= 4n^4 - 4n^4 - 8n² -8n - 1 + 4

4n^4 - 4n^4 cancel out with each other since one is negative and the other is positive. So we're left with - 8n² -8n - 1 + 4

= - 8n² -8n - 1 + 4

= - 8n² -8n + 3

5 0
3 years ago
Can someone please give me the (Answers) to this? ... please ...<br><br> I need help….
blagie [28]

Answer:

1. 8.04

2. 20 feet

3. d

4. c

5. Ed = 4

Step-by-step explanation:

Pythagoras theorem

a² + b² = c²

4² + b² = 6²

16 + b² = 36

b² = 20

square root 20 = 4.47

6 ÷ 4.47 = 1.34

6 × 1.34 = 8.04

8 0
3 years ago
Which of the following is a solution of x^2-7x=5
Contact [7]

Answer:

x=

7

2

+

1

2

√69 or x=

7

2

+

−1

2

√69

Step-by-step explanation:

Step 1: Subtract 5 from both sides.

x2−7x−5=5−5

x2−7x−5=0

Step 2: Use quadratic formula with a=1, b=-7, c=-5.

x=

−b±√b2−4ac

2a

x=

−(−7)±√(−7)2−4(1)(−5)

2(1)

x=

7±√69

2

x=

7

2

+

1

2

√69 or x=

7

2

+

−1

2

√69

6 0
4 years ago
The lifetimes of 10,000 watch batteries are normally distributed the mean lifetime is 500 days the standard deviation is 60 days
Lelu [443]
Given:
μ = 500 days, the population mean
σ = 60 days, the population standard deviation

Therefore
μ + σ = 560
μ - σ = 440
μ + 2σ = 620
μ - 2σ = 380
μ + 3σ = 680
μ - 3σ = 320

The figure shown below illustrates the normal distribution
About 68% of the total area lies in x = (μ-σ, μ+σ)
About 95% of the total area lies in x = (μ-2σ, μ+2σ)
About 99.7% of the total area lies in x = (μ-3σ, μ+3σ).

7 0
4 years ago
The cost of food and medication for a cat is $5 less than two-thirds of the cost of food and medication for a dog.
chubhunter [2.5K]
The formula you can use for this is y=2/3×-5
Where the y is the cost of cats food and x is the cost of the dogs food
6 0
3 years ago
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