All categories

4 years ago

What does a negative minus a positive equal to

1 answer:

6 0

A negative number minus a positive would be negative . EX : -7 - 2. Since you use the rule of subtraction, it would turn into -7 + -2. Which would be -9. Do you understand ? If you have any questions feel free to ask me !

You might be interested in

Select the correct answer.

prohojiy [21]

Answer:

I think it is C sorry if it wrong

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

If $8500 is invested at 12.7% compounded continuously, the future value S at any time t (in years) is given by the following for

Serjik [45]

Answer:

Given formula is :

S = $8500e^{0.127t}$

We have p = 8500

r = 12.7% or 0.127

(a) when t = 18 months or $\frac{18}{12}=1.5$ years

S = $8500e^{0.127(1.5)}$

= $8500e^{0.1905}$

= $e^{0.1905}$ = 1.20985

S = $10283.73

(b) Investment doubles means S = $8500\times2=17000$

$17000=8500e^{0.127t}$

$\frac{17000}{8500}=e^{0.127t}$

=> $2=e^{0.127t}$

Taking log on both sides

$ln(2)=ln(e^{0.127t})$

We get t = 5.45 years

8 0

4 years ago

Pls help A.S.A.P need now!!!!!!!!!!!!!!!!!!!

valkas [14]

Answer:

Step-by-step explanation:

Put 4 where x is and evaluate.

... f(4) = 3·4² -2·4

... f(4) = 3·16 - 8

... f(4) = 48 - 8 = 40

6 0

3 years ago

Read 2 more answers

4. Find the value of x & y from the following equation 4x+5y=90, x+y=20 a. 10, 15 b. 10, 5 c. 10, 8 d. 10, 10

ira [324]

An equation is formed of two equal expressions. In the two of the given equations, the value of x and y are 10 and 10, respectively. The correct option is D.

<h3>What is an equation?</h3>

An equation is formed when two equal expressions are equated together with the help of an equal sign '='.

Given the two of the equation, which can be named as,

4x+5y=90 ...... equation 1

x+y=20 ............ equation 2

Solve the second equation for x,

x + y = 20

x = 20 - y ................ equation 3

In the first equation substitute the value of x from the third equation,

4x + 5y = 90

4(20 - y) + 5y = 90

Solving the equation for y,

80 - 4y + 5y = 90

y = 90 - 80

y = 10

Substitute the value of y in the second equation, to get the value of x,

x + y = 20

x + 10 = 20

x = 20 - 10

x = 10

Hence, In the two of the given equations, the value of x and y are 10 and 10, respectively.

Learn more about Equation here:

brainly.com/question/10413253

#SPJ5

3 0

1 year ago

Read 2 more answers

Assume that both populations are normally distributed. a) Test whether mu 1 not equals mu 2 at the alpha equals 0.05 level of s

Radda [10]

Answer:

$(16.2-14.1) -2.03 \sqrt{\frac{4.5^2}{19} +\frac{3.1^2}{19}} = -0.445$

$(16.2-14.1) +2.03 \sqrt{\frac{4.5^2}{19} +\frac{3.1^2}{19}} = 4.645$

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$n_1 = 19$ sample size 1

$n_2 = 19$ sample size 2

$\\bar X_1 = 16.2$ sample mean for group 1

$\\bar X_2 = 14.2$ sample mean for group 2

$s_1 = 4.5$ sample deviation for group 1

$s_2 = 3.1$ sample deviation for group 2

Solution to the problem

For this case the confidence interval is given by:

$(\bar X_1 -\bar X_2) \pm t_{\alpha/2} \sqrt{\frac{s^2_1}{n_1} +\frac{s^2_2}{n_2}}$

And the degrees of freedom are given by:

$df = n_1 +n_2 -2 = 19+19 -2= 36$

We want a 95% of confidence o then the significance level is 1-0.95 =0.05 and $\alpha/2 = 0.025$ if we find a critical value in the t distribution with 36 degrees of freedom we got:

$t_{cric} =2.03$

And replacing we got:

$(16.2-14.1) -2.03 \sqrt{\frac{4.5^2}{19} +\frac{3.1^2}{19}} = -0.445$

$(16.2-14.1) +2.03 \sqrt{\frac{4.5^2}{19} +\frac{3.1^2}{19}} = 4.645$

5 0

3 years ago