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steposvetlana [31]
3 years ago
14

How to solve -40=30m-16?

Mathematics
2 answers:
Gennadij [26K]3 years ago
7 0
What I would do for this problem, is move all the terms that don't contain m to the right side, and then solve.
m = 4/5.
Varvara68 [4.7K]3 years ago
5 0
You have to isolate the variable. This is how you do it.

-40= 30m - 16
add 16 to both sides
-24= 30m
divide 30 from both sides
-24/30=m
simplify
-4/5=m
or as a decimal
-0.8=m
I hope this helps love! :)
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At homecoming, 125 tickets where sold. Tickets purchased for homecoming cost $20.5 without an activity card, and $15.75 with an
ale4655 [162]

Answer:

Nearly 83 students did not had activity card.

Nearly 42 students had an activity card.

Step-by-step explanation:

Total number of tickets sold at homecoming = 125

Cost of each  ticket without activity card = $20.5

Cost of each  ticket with activity card = $15.75

Total amount earned  = $2365

Let, the number of tickets sold without activity car d  = k

So, the number of tickets sold without card = (Total sold - k)

                                                                          = 125 - k

Now, according to the question:

$20.5(k) + $15.75(125 - k)  =  $2365

or, 20.5 k + 1968.5 - 15.75 k = 2365

⇒ 4.75 k = 2365 - 1968.5 = 396.5

⇒ k = \frac{396.5}{4.75 }  = 83.47

Hence, nearly 83 students did not had activity card.

So,the number of students that had activity card = 125 - 83.47 = 41.53 ~  42

Hence, nearly 42 students had an activity card.

4 0
2 years ago
In a metal fabrication​ process, metal rods are produced to a specified target length of 15 feet. Suppose that the lengths are n
Leto [7]

Answer:

95% Confidence interval: (14.4537 ,15.1463)

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 15 feet

Sample mean, \bar{x} = 14.8 feet

Sample size, n = 16

Alpha, α = 0.05

Sample standard deviation, σ = 0.65 feet

Degree of freedom = n - 1 = 15

95% Confidence interval:

\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}  

Putting the values, we get,  

t_{critical}\text{ at degree of freedom 15 and}~\alpha_{0.05} = \pm 2.1314  

14.8 \pm 2.1314(\dfrac{0.65}{\sqrt{16}} ) \\\\= 14.8 \pm 0.3463 = (14.4537 ,15.1463)  

is the required confidence interval for the true mean length of rods.

3 0
3 years ago
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How do you know where to put the parentheses in an equation?
ziro4ka [17]
Parentheses are used to identify which numbers you should add,multiply .ect first. So If i had

12-(3+1)=x    

then you would want to solve 3+1 before you subtract 12.
7 0
3 years ago
Read 2 more answers
13
nlexa [21]

So say we have the number: 54,321

The 5 would be worth 50,000 meaning it's in the ten thousands place.

The 4 would be worth 4,000 meaning it's in the thousands place.

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The difference between them is a zero, so the ten thousands place is 10 times bigger than the thousands place

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Hope that helps :)

7 0
3 years ago
before leavibg ri visit mexico levabt traded 270 american dollars and received 3000 mexican pesos. when he returned from Mexico
marta [7]
The answer is 1111.111111
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