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slega [8]
3 years ago
6

I need help with this ​

Mathematics
1 answer:
mafiozo [28]3 years ago
5 0

Answer:

7.9•10^3

Step-by-step explanation:

keep 7.9 and the subtract the exponents

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Perform the indicated operation. (12x2 + 7y3)(4x2 + 7y3)
Verdich [7]

ANSWER

48 {x}^{4}  + 60{x}^{2} {y}^{3} +  56 {y}^{6}

EXPLANATION

We want expand:

(12x^2+8y^3)(4x^2+7y^3)

We expand using the distributive to obtain:

12 {x}^{2} (4 {x}^{2}  + 7 {y}^{3} ) + 8 {y}^{3} (4 {x}^{2}  + 7 {y}^{3} )

48 {x}^{4}  + 28 {x}^{2}  {y}^{3} + 32{x}^{2} {y}^{3}  +  56 {y}^{6}

Simplify further by combining the two terms in the middle:

48 {x}^{4}  + 60{x}^{2} {y}^{3} +  56 {y}^{6}

4 0
4 years ago
Read 2 more answers
Help me please. what is the solution for<br> 4≤n−4
notka56 [123]

Answer:

n\geq8

Step-by-step explanation:

You add 4 to both sides to make n the only thing on one side. Then to make the answer look better you move n to the left side and flip the symbol because n changed sides.

4\leq n-4\\ 4+4\leq n-4+4\\ 8\leq n\\ n\geq 8

7 0
3 years ago
A car travels 65 km in 45 minutes what is the average speed of the car in km/h
nekit [7.7K]
So to begin your problem, you know that your car already has an average which is 65km/45 mins. The problem wants you to change this to km/hr. This means that you need to convert minutes to hours. A simple way to do this is by using fractions. 
Set your problem up with fractions similar to this:
65km/45 mins x 60 mins/1 hr.
the whole point is to cancel out your minutes, and leave the hours as your new unit for the denominator
65km/45 x 60/1 hr. 
now you want to reduce (I divided the first fraction by 5)
13km/9 x 60/1 hr.
780km/9hrs. 
That would be your answer. If someone can double check my math that would be fantastic.


5 0
3 years ago
Read 2 more answers
Wire electrical-discharge machining (WEDM) is a process used to manufacture conductive hard metal components. It uses a continuo
algol13

Answer:

a. no, there are no sufficient data to use

b. assumption b is right

Step-by-step explanation:

a. for the standard deviation to be calculated at 99% confidence, the data needed should be the mean (given), the variate value to be calculated for(not given), the standard deviation(not given), the z value of the normal distribution ( not given),

since there are too many unknown, the data given are not sufficient to calculate.

b. validity of this interval requires that coating layer thickness be at least approximately normally distributed.

6 0
4 years ago
Which unit is used to measure weight<br>​
Alex787 [66]

Answer:

Pound or kilograms

Step-by-step explanation:

That is some of the units to measure weight

4 0
3 years ago
Read 2 more answers
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