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3 years ago

Solve the equations) 1.-2q-5=-11 2.w/3+2=5

Mathematics

2 answers:

Veronika [31]3 years ago

5 0

Answer:

1. q = 3

2. w = 9

Step-by-step explanation:

-2q - 5 = -11

Add 5 to both sides:

-2q - 5 + 5 = -11 + 5

-2q = -6

Divide both sides by 2:

-2q ÷ 2 = -6 ÷ 2

-q = -3

Divide both sides by -1:

-q ÷ -1 = -3 ÷ -1

q = 3

w/3 + 2 = 5

Subtract 2 from both sides

w/3 = 3

Multiply both sides by 3:

w = 9

-Chetan K

Step2247 [10]3 years ago

4 0

Answer:

1) -2q-5=-11

1) -2q=-11+5

1) -2q=-6

1) q=-6/-2

1) q=3

2) w/3+2=5

w/3=5-2

w/3=3

w=3×3

w=6

Step-by-step explanation:

hope this helps you!!

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Calcular: E = (sec245o + tg45o) ctg37o - 2cos60o

Vlada [557]

Answer:

$-2.813$

Step-by-step explanation:

Se simplifica inicialmente la fórmula en términos de las funciones trigonométricas fundamentales (Initially, the formula is simplified in terms of fundamental trigonometric functions):

$(\sec 245^{\circ} + \tan 45^{\circ} )\cdot \cot 37^{\circ} - 2\cos 60^{\circ}$

$\left(\frac{1}{\cos 245^{\circ}}+\frac{\sin 45^{\circ}}{\cos 45^{\circ}} \right)\cdot \left(\frac{\cos 37^{\circ}}{\sin 37^{\circ}} \right) - 2\cdot \cos 60^{\circ}$

$(-2.366 + 1 )\cdot (1.327) - 1$

$-2.813$

7 0

3 years ago

Determine whether each equation is a linear equation. Write yes or no. If yes, write the equation in standard form. y = 4x + x

Step2247 [10]

Answer:

The answer is y = 5x

Step-by-step explanation:

Yes, this equation is a linear equation.

because it has degree 1

Standard Form

y = 4x + x

y = 5x

Thus, The answer is y = 5x

-TheUnknownScientist 72

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3 years ago

Pls, help. ASAP. just think about the pts and brainliest

Alenkasestr [34]

Answer:8.9

Step-by-step explanation:

192/43 is about 4.46

4.46*2 is about 8.9

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4 years ago

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Why does the fact family for 81 and 9 have only two number sentences

Julli [10]

It only has two number sentences because 81 divided by anything else wont work only 9 would. Also since 9 times 9 is equal to 81

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3 years ago

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A average amount of money on deposit in a savings account is $7500. Suppose a random sample of 49 accounts shows the average in

Valentin [98]

Answer:

z=-3.79

$p_v =2*P(z$

Step-by-step explanation:

1) Data given and notation

$\bar X=6850$ represent the mean average amount of money on deposit in savings account for the sample

$\sigma=1200$ represent the population standard deviation for the sample

$n=49$ sample size

$\mu_o =7500$ represent the value that we want to test

$\alpha=0.01$ represent the significance level for the hypothesis test.

z would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

2) State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the mean for the amount of money on deposit in savings account differs from 7500, the system of hypothesis would be:

Null hypothesis: $\mu =7500$

Alternative hypothesis: $\mu \neq 7500$

Since we know the population deviation, is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:

$z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

3) Calculate the statistic

We can replace in formula (1) the info given like this:

$z=\frac{6850-7500}{\frac{1200}{\sqrt{49}}}=-3.79$

4)P-value

Since is a two-sided test the p value would be:

$p_v =2*P(z$

5) Conclusion

If we compare the p value and the significance level given $\alpha=0.01$ we see that $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, so we can conclude that the average amount of money deposit in savings account its significantly different from 7500 tons at 1% of signficance.

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4 years ago