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Serhud [2]
4 years ago
14

Explain 81-16 in mental math

Mathematics
2 answers:
Tems11 [23]4 years ago
3 0

Answer:

we have  

(81-16)  

One way to use mental math is to add  4  to both  81  and  16  

so

81+4=85\\ 16+4=20\\ 85-20=65  

therefore

81-16=65  

the answer is

65

Step-by-step explanation:


Dovator [93]4 years ago
3 0

Answer:

65 See below

Step-by-step explanation:

when doing mental math you need to break it apart to more manageable chunks.  

I would think of this as  70 and  11 - 6 = 75 then subtract 10 = 65

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Nadia is a stockbroker. She earns 12% commission each week. Last week, she sold $5400 worth of stocks. How much did she make las
Inga [223]

Answer:

a). Nadia made a total of $825 last week in commission sales

b). The total amount Nadia in commission in 2011=$42,900

Step-by-step explanation:

Step 1

Express the amount in commission she earns from her sales as follows;

C=S×r

where;

C=commission earned

S=total value of stock sales

r=commission rate

In our case;

C=unknown

S=$7,500

r=11%=11/100=0.11

replacing;

C=11% of 7,500

C=(11/100)×7,500

C=0.11×7,500=825

Nadia made a total of $825 last week in commission sales

b). To express the total amount she made in 2011, we derive the formula below;

Total amount (2011)=Average weekly commission×number of weeks in 2011

where;

Average weekly commission=$825

number of weeks in 2011=52

replacing;

Total amount (2011)=(825×52)=42,900

The total amount Nadia in commission in 2011=$42,900

6 0
3 years ago
What is the eighth letter in this question not Counting spaces? W is the first H is the second etc
alexandr402 [8]
The eighth letter is ‘H’
5 0
3 years ago
Jenna has a rectangular pig pen that measures 8m wide by 10m long. She wants to increase the area to 168 m^2 by increasing the l
babunello [35]

Answer:

The answer is A

Step-by-step explanation:

I just took the test and it was the answer!

4 0
3 years ago
Choose the correct response​
lilavasa [31]

Answer:

f(2) = 9

Step-by-step explanation:

It's give in the question,

Two different functions are,

f(x) = 4x + 1

g(x) = -2x

Then we have to find the output value of function 'f' for the input value x = 2.

By substituting the value of x in the function 'f',

f(2) = 4(2) + 1

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f(2) = 9

5 0
3 years ago
The total cost of 4 starfish was $7.20. Write and solve an equation to find how much one starfish cost.
Lyrx [107]

Answer:

$1.80

Step-by-step explanation:

4x = 7.20

x = 1.80

7 0
3 years ago
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