2 years ago

Solve the system of linear equations by substitution. −2x−5y=3 3x+8y=−6

Mathematics

1 answer:

DochEvi [55]2 years ago

7 0

Answer:

x=6 y=-3

Step-by-step explanation:

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scoundrel [369]

Answer:7

Step-by-step explanation:

A) x= -21/-3

= 7 answer

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2 years ago

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If 15x+17*2=227 what is x

sladkih [1.3K]

X will be 35 but idk the formula

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2 years ago

Nine is 4 percent of what number

Katarina [22]

Answer:

225

Step-by-step explanation:

We can model this question with:

9 = 0.04x

x represents "what number."

0.04x = 9.

Divide 0.04 from both sides

0.04x ÷ 0.04 = 9 ÷ 0.04

9 ÷ 0.04 = 225.

Therefore, 9 is 4% of 225.

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2 years ago

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To compare two products such as colas, a random sample is selected to taste two types of colas (A and B). Each selected subject

Nadya [2.5K]

Answer: The sample size would be needed = 385

Step-by-step explanation:

Let p be the prior population proportion.

Margin of error = E

When not estimate of p is given , the formula to calculate the minimum sample size n = $0.25(\dfrac{z^*}{E})^2$ , where z* = critical value for given confidence interval.

Here z* for 95% confidence level is 1.96.

E=5%=0.05

Then $n=0.25(\dfrac{1.96}{0.05})^2\approx385$

Hence, the sample size would be needed = 385

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2 years ago

Solve . (5 points) Question 5 options: 1) −20 2) −24 3) 20 4) 24

e-lub [12.9K]

Answer:

18 21 24 24 =87 maybe trying to help

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