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Maksim231197 [3]
3 years ago
8

Which of the following options have the same value as 70% of 80?

Mathematics
2 answers:
snow_tiger [21]3 years ago
7 0
56 is the answer so it's A, C and E.
lys-0071 [83]3 years ago
3 0
I believe the answers are: A C E
You might be interested in
Is 2.799 greater than 2.79 ?
BlackZzzverrR [31]
Yes because 2.799 has a extra digit but if there is an answer that they can be the same then they are the same
6 0
3 years ago
Heather has divided ​$5400 between two​ investments, one paying 8​%, the other paying 5​%. if the return on her investment is ​$
Phantasy [73]

Answer:

$2500 at 8%.

$2900 st 5%.

Step-by-step explanation:

Let x be the amount invested at rate of 8% and y be the amount invested at the rate of 5%.

We have been given that Heather has divided ​$5400 between two​ investments. We can represent this information as:

x+y=5400...(1)

The return on her investment is ​$345.  

Earnings from the investment at 8% will be 8% of x.

Earnings from the investment at 5% will be 5% of y.

(\frac{8}{100})x+(\frac{5}{100})y=345...(2)

0.08x+0.05y=345...(2)

We will use substitution method to solve our system of equations. From equation (1) we will get,

x=5400-y

Substituting this value in equation (2) we will get,

0.08(5400-y)+0.05y=345

432-0.08y+0.05y=345

-0.08y+0.05y=345-432

-0.03y=-87

\frac{-0.03y}{-0.03}=\frac{-87}{-0.03}

y=2900  

Therefore, Heather has invested an amount of $2900 at 5%.

Let us substitute y=2900 in equation (1) to solve for x.

x+2900=5400

x+2900-2900=5400-2900

x=2500

Therefore, Heather has invested an amount of $2500 at 8%.

6 0
3 years ago
Perform the operation. Enter your answer in scientific notation.<br> 9 x 10^*8 - 5.3 x 10^*8 =
PilotLPTM [1.2K]

Answer:

3.7x10^8

Step-by-step explanation:

did it on calc

3 0
2 years ago
Help me find Sample variance and standard deviation
AnnZ [28]
First, find the mean. You'll need it to compute the variance.

\bar x=\displaystyle\frac15\sum_{i=1}^5x_i=\dfrac{21+10+6+7+11}5=11

The variance of the sample is then computed with the formula

s^2=\displaystyle\dfrac1{5-1}\sum_{i=1}^5(\bar x-x_i)^2=\dfrac{(21-11)^2+\cdots+(11-11)^2}4=\dfrac{71}2=35.5

The standard deviation is the square root of the variance, so

s=\sqrt{35.5}\approx5.958
5 0
3 years ago
HELPPPPPPPPPPPPPPPPPPPPPP
OverLord2011 [107]

Answer:

11

Step-by-step explanation:

1st plug in the given numbers for each variable (the letters)

4 x 6 ÷ 3 + 3 =

Next, use the order of operations to solve the expression.

4 x 6 ÷ 3 + 3 =

24 ÷ 3 + 3 =

8 + 3 = 11

7 0
3 years ago
Read 2 more answers
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