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Yanka [14]
3 years ago
15

Tell how the Communicative property of addition and the Associative property of addition can help solve the problem mentally 8+(

-5)+(-8)
Mathematics
2 answers:
topjm [15]3 years ago
4 0

Step-by-step explanation:

Communicative property states that, in addition, integers added in any order will still give the same answer.

So in this question,

rather than first adding 8 + (-5), we add 8 + (-8)

We know that a number + its additive Inverse (opposite sign) is equal to zero

And we know any number added to zero is equal to the number.

So we can quickly find out that the sum is -5

AlexFokin [52]3 years ago
4 0

Answer:

Communicative property states that, in addition, integers added in any order will still give the same answer. and a negative and a positive cancel out and your left with negative five so negative five would be your answer

Step-by-step explanation:

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Please please help
Helen [10]

Answer: A. have the same slope

Step-by-step explanation:

b. bisect means right in half but not fully intersecting kinda looks like this _l_ *oh and it asked you to prove that they bisect so clicking on it don't really make sense*

c. perpendicular means there is four equal angels and that is 90 degree angels

d. parallel... well it's obviously not parallel because parallel are two lines that are exactly the same but never intersect

*intersect means touch*

7 0
3 years ago
On a factory floor, 30 out of every 140 toy robots is defective. What percent is defective?
yaroslaw [1]

Answer:

21.43\%

Step-by-step explanation:

we know that

To find out the percent of robots which are defective, divided the number of defective robots by the total number of robots and multiply the result by 100

Let

x ----> the number of defective robots

y ----> the total number of robots

p ---> percentage of robots which are defective

so

p=\frac{x}{y} (100)

we have

x=30\\y=140

substitute

p=\frac{30}{140}(100)

p=21.43\%

5 0
3 years ago
Carlos and Michael are collecting baseball cards. Carlos has 85 and buys 10 more each week. Michael has 120 and receives 5 more
GarryVolchara [31]

Answer:

Michael and Carlos will have the same amount after 7 weeks

Step-by-step explanation:

Assume the total number of baseball cards that Carlos and Michael need to have to be equal is y, and the amount of time in terms of weeks that it will take for this to be achieved is x.

The following expressions can be derived

For Carlos to achieve y, he will need 85 and an addition of 10 per week (x):

y=85+(10x)..........equation 1

For Michael to achieve y, he will need 120 and an addition of 5 per week (x):

y=120+(5x)..........equation 2

Equating equation 1 and 2 to solve for x

85+10x=120+5x

10x-5x=120-85

5x/5=35/5

x=7

Number of weeks it will take Michael and Carlos to have the same amount=x=7 weeks

5 0
3 years ago
Is theres 10 birds and i shoot 1 how many is there left?
bazaltina [42]
There would be 9 birds left. 10-1=9
3 0
3 years ago
The u.s. dairy industry wants to estimate the mean yearly milk consumption. a sample of 16 people reveals the mean yearly consum
lidiya [134]
1-2. The best estimate for the population mean would be sample mean of 60 gallons. Since we know that the sample mean is the best point of estimate. Since sample size n=16 is less than 25, we use the t distribution. Assume population from normal distribution.

3. Given a=0.1, the t (0.05, df = n – 1 = 15)=1.75

4. xbar ± t*s/vn = 60 ± 1.75*20/4 = ( 51.25, 68.75)

5. Since the interval include 63, it is reasonable.
3 0
3 years ago
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