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3 years ago

-6x+5y=-30 solve for y Isolate the variable

Mathematics

2 answers:

Stolb23 [73]3 years ago

7 0

It would be y = -6/5 - 5

GenaCL600 [577]3 years ago

5 0

Answer:

y = -6 + 6x/5

Step-by-step explanation:

Move all terms that don't containy to the right side and solve. Hope it helps.

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What is the answer to 53=−19z+5+7z

nikklg [1K]

53= -19z+5+7z
53= -12z+5 (combine -19z and 7z)
48= -12z. ( subract 5 on both sides)
-4=z. (divide by -12 both sides)

8 0

3 years ago

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PLS HELP! asap!! use the graph to determine which of the following points is a solution to the equation?

shusha [124]

D (3,0) that’s the answer

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3 years ago

Which choice is equivalent to the expression below √-81

garri49 [273]

Answer:

Step-by-step explanation:

$\sqrt{-81}$ is the same as $\sqrt{81}$ · $\sqrt{-1}$

This can be simplified to 9 · $\sqrt{-1}$

And the square root of -1 is i,

so this equals 9i

4 0

4 years ago

Solve 4(t + 1) = 6t -1

lyudmila [28]

Answer:

t=5/2

Step-by-step explanation:

4(t + 1) = 6t -1

=>4t+4=6t-1

=>6t-4t=4+1

=>2t=5

=>t=5/2

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3 years ago

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We wish to estimate what percent of adult residents in a certain county are parents. Out of 500 adult residents sampled, 175 had

shepuryov [24]

Answer:

The 99% confidence interval is $0.3003 < I < 0.3997$

Step-by-step explanation:

From the question we are told that

The sample size is $n = 500$

The the number that are parents x = 175

The proportion of parents is mathematically represented as

$\r p = \frac{x}{n}$

substituting values

$\r p = \frac{175}{500}$

$\r p = 0.35$

The level of confidence is given as 99% which implies that the level of significance is

$\alpha = 100 - 99$

$\alpha =$ 1%

$\alpha = 0.01$

The critical value for this level of significance is obtained from the table of critical value as

$t_{x, \alpha } = t_{175, 0.05} = 2.33$

Generally the margin of error is mathematically evaluated as

$M =\frac{ t_{175, 0.01 } * \sqrt{\r p (1-\r p)} }{\sqrt{n} }$

substituting values

$M =\frac{ 2.33 * \sqrt{\r 0.35 (1-0.35)} }{\sqrt{500} }$

$M = 0.0497$

Generally the 99% confidence interval is mathematically represented as

$I = \r p \pm M$

$\r p -M < I < \r p + M$

substituting values

$0.35 -0.0497 < I < 0.35 + 0.0497$

$0.3003 < I < 0.3997$

5 0

3 years ago