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3 years ago

ALL MY QUESTIONS GETTING IGNORED PLS HELP

Mathematics

1 answer:

Novosadov [1.4K]3 years ago

4 0

Answer:

x=9

Step-by-step explanation:

a scale drawing means all the sides are multiplied by the same amount. to find this amount, you can divide the larger side by the bigger side by the smaller side.

15/5 = 3

12/4 = 3

therefore the scale factor is 3. to get the value of x, multiply the value of the third side by 3.

3*3=9

x=9

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4 years ago

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4 years ago

A certain alloy contains 14.25% nickel. How much nickel is there in a piece weighing 375 pounds? Round your answer to the neares

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4 years ago

Read 2 more answers

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katovenus [111]

Answer: see below

Step-by-step explanation:

17) 5n - 3 > -2n + 4 and 9 - 4n ≥ -2n + 1

+2n +2n +2n +2n

7n - 3 > 4 9 - 2n ≥ 1

+3 +3 -9 -9

7n > 7 -2n ≥ -8

÷7 ÷7 ÷ -2 ↓ ÷ -2

n > 1 and n ≤ 4

Graph: o----------------- ·

1 4

18) 9k - 2 ≤ 9 + 10k < 9 - 4k

9k - 2 ≤ 9 + 10k and 9 + 10k < 9 - 4k

-10k -10k +4k +4k

-k - 2 ≤ 9 9 + 14k < 9

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÷ -1 ↓ ÷ -1 ÷14 ÷14

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Graph: · -----------------o

-11 0

19) 4 - n ≤ 10 + 5n ≤ 6n + 1

4 - n ≤ 10 + 5n and 10 + 5n ≤ 6n + 1

-5n -5n -6n -6n

4 - 6n ≤ 10 10 - n ≤ 1

-4 -4 -10 -10

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20) 4p - 5 ≤ 2p + 9 ≤ 4p + 7

4p - 5 ≤ 2p + 9 and 2p + 9 ≤ 4p + 7

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3 years ago

An investigator wants to estimate caffeine consumption in high school students. how many students would be required to estimate

astraxan [27]

We can solve this problem by referring to the standard probability distribution tables for z.

We are required to find for the number of samples given the proportion (P = 5% = 0.05) and confidence level of 95%. This would give a value of z equivalent to:

z = 1.96

Since the problem states that it should be within the true proportion then p = 0.5

Now we can find for the sample size using the formula:

n = (z^2) p q /E^2

where,

p = 0.5

q = 1 – p = 0.5

E = estimate of 5% = 0.05

Substituting:

n = (1.96^2) 0.5 * 0.5 / 0.05^2

n = 384.16

Around 385students are required.

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3 years ago