2 years ago

If -7-4r=-15, what is the value of r/2 + 9

Mathematics

1 answer:

TEA [102]2 years ago

6 0

Answer:

Step-by-step explanation:

Consider -7-4r=-15. Adding 7 on both sides of the equation,

-4r=-8 --- r = 2

Plug in value of r in r/2 + 9 = 2/2+9 = 1+9 = 10

You might be interested in

A mountain's peak is 1,224 feet above sea level while the valley is 339 feet below sea level. What is the elevation drop between

Archy [21]

1224+339=1563

Answer is 1,563 feet. Hope this helps.

6 0

3 years ago

Read 2 more answers

Find the probability that when a couple has three children, at least one of themis a girl. (Assume that boys and girls are equal

kvv77 [185]

Answer: $\bold{\dfrac{7}{8}=87.5\%}$

Step-by-step explanation:

"At least one girl" means P(1 girl) + P(2 girls) + P(3 girls) or 1 - P(all boys)

I will use the latter: 1 - P(all boys)

P(all boys) = $\dfrac{1}{2}\times \dfrac{1}{2}\times \dfrac{1}{2}=\dfrac{1}{8}$

$1 - P(all\ boys) \quad = \quad 1-\dfrac{1}{8}\quad =\large\boxed{\dfrac{7}{8}}$

6 0

3 years ago

Finding the vaule of an angle

Sergio039 [100]

(3x-5)+(x+1)=180
x=46
3(46)-5=133
m

6 0

3 years ago

Read 2 more answers

Simplfy -3+(-10) please explain how to do it too because i am lost in algebra.

Margaret [11]

Answer:
-13

you're basically adding -3 and -10 because they're both negatives

4 0

2 years ago

In order to estimate the average time spent on the computer terminals per student at a local university, data were collected fro

VladimirAG [237]

Answer:

Margin of error for a 95% of confidence intervals is 0.261

Step-by-step explanation:

Step1:-

Sample n = 81 business students over a one-week period.

Given the population standard deviation is 1.2 hours

Confidence level of significance = 0.95

Zₐ = 1.96

Margin of error (M.E) = $\frac{Z_{\alpha }S.D }{\sqrt{n} }$

Given n=81 , σ =1.2 and Zₐ = 1.96

Step2:-

 $Margin of error (M.E) = \frac{Z_{\alpha }S.D }{\sqrt{n} }$ 

 $Margin of error (M.E) = \frac{1.96(1.2) }{\sqrt{81} }$ 

On calculating , we get

Margin of error = 0.261

Conclusion:-

Margin of error for a 95% of confidence intervals is 0.261

4 0

3 years ago