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DaniilM [7]
3 years ago
15

Solve the equation -14+2b+= -2b+2​

Mathematics
2 answers:
disa [49]3 years ago
8 0

Answer:

b=4

Step-by-step explanation:

-14+2b= -2b+2​

Add 2b to each side

-14+2b+2b= -2b+2b+2

-14+4b =2

Add 14 to each side

-14+4b+14= 14+2​​

4b = 16

Divide each side by 4

4b/4 = 16/4

b =4

Harrizon [31]3 years ago
3 0
-14+2b=-2b+2

2b-14+2b=-2b+2+2b
4b-14=2

4b-14+14=2+14
4b=16

4b/4 = 16/4
B= 4

ANSWER:
b=4
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In a​ study, 36​% of adults questioned reported that their health was excellent. A researcher wishes to study the health of peop
steposvetlana [31]

Answer:

0.3907

Step-by-step explanation:

We are given that 36​% of adults questioned reported that their health was excellent.

Probability of good health = 0.36

Among 11 adults randomly selected from this​ area, only 3 reported that their health was excellent.

Now we are supposed to find the probability that when 11 adults are randomly​ selected, 3 or fewer are in excellent health.

i.e. P(x\leq 3)=P(x=1)+{P(x=2)+P(x=3)

Formula :P(x=r)=^nC_r p^r q ^ {n-r}

p is the probability of success i.e. p = 0.36

q = probability of failure = 1- 0.36 = 0.64

n = 11

So, P(x\leq 3)=P(x=1)+{P(x=2)+P(x=3)

P(x\leq 3)=^{11}C_1 (0.36)^1 (0.64)^{11-1}+^{11}C_2 (0.36)^2 (0.64)^{11-2}+^{11}C_3 (0.36)^3 (0.64)^{11-3}

P(x\leq 3)=\frac{11!}{1!(11-1)!} (0.36)^1 (0.64)^{11-1}+\frac{11!}{2!(11-2)!}  (0.36)^2 (0.64)^{11-2}+\frac{11!}{3!(11-3)!} (0.36)^3 (0.64)^{11-3}

P(x\leq 3)=0.390748

Hence  the probability that when 11 adults are randomly​ selected, 3 or fewer are in excellent health is 0.3907

5 0
3 years ago
Solve the formula for the indicated variable.<br> T(r+s)=rs, for r<br> (Simplify your answer.)
yaroslaw [1]

Answer:

R = \frac{-TS}{(T-S)}

Step-by-step explanation:

First, distribute all terms

T(R+S) =RS\\TR + TS =RS

Get all terms with R onto the same side

TR + TS = RS\\TR - RS = -TS

Factor out the R

R(T-S)=-TS

Divide by (T-S) to isolate R

R = \frac{-TS}{(T-S)}

5 0
3 years ago
Read 2 more answers
18 is what percent of 40
marshall27 [118]

Answer:

45%

Step-by-step explanation:

Create a fraction with the of " something " on the denominator and multiply by 100% to create the percentage, that is

percent = \frac{18}{40} × 100% = 45%

7 0
2 years ago
Read 2 more answers
A train traveled 504 miles in 8 hours. A bus traveled 531 miles in 9 hours. Which mode of transportation has the faster rate?
OlgaM077 [116]
The train because it travels at 63 mph while the bus is 59 mph
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2 years ago
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Mario walked at 3.9 miles per hour for 0.72 hours how far did she walk
nasty-shy [4]
The speed at which Mario can walk is given in the question and it is 3.9 miles/hour. Also we get to know from the question that Mario walked for 0.72 hours. The question requires the answer to the distance for which Mario walked.
Now
Mario in 1 hour can cover a distance of 3.9 miles
The n
The distance covered by Mario in 0.72 hours = (3.9 * 0.72) miles
                                                                         = 2.808 miles
Then the distance covered by mario in o.72 hours is 2.808 miles.
7 0
3 years ago
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