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kakasveta [241]
3 years ago
11

In algerbra we use an blank to represent a varible

Mathematics
1 answer:
Juli2301 [7.4K]3 years ago
3 0

Answer:

We use letters to represent a variable in expressions. I hope this helps!

Step-by-step explanation:

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If a thousand dollars is put into a bank account each year the account earns 7% simple interest in 4 years how much interest wou
ser-zykov [4K]

Answer:

$280

Step-by-step explanation:

According to the problem, calculation of the given data are as follows:

Principal amount (P) = $1,000

Rate of interest (r) = 7%

Time period (t) = 4 years

Here we use simple interest formula to calculate interest after 4 years.

I = P × r × t

By putting the value, we get

I = $1,000 × 7% × 4

= $70 × 4

= $280

8 0
3 years ago
A recent report indicated that 22 percent of the households in a certain community speak a
Irina-Kira [14]

Answer:

16.1157

Step-by-step explanation:

7 0
2 years ago
In a certain​ year, brand A of​ heart-rate watch cost ​$39.99 and brand B cost ​$59.99. A nonprofit community health organizatio
Oksi-84 [34.3K]

Answer:

Brand A = 21 heart-rate watches.

Brand B = 13 heart-rate watches.

Step-by-step explanation:

Let A be the number of Brand A heart watches and B be the number of Brand B heart watches.

We have been given that a nonprofit community health organization purchased 34 ​heart-rate watches for use at a wellness center.

We can represent this information in an equation as:

A+B=34...(1)

We have been given that in a certain​ year, brand A of​ heart-rate watch cost ​$39.99 and brand B cost ​$59.99 and the organization spent ​$1619.66 for the​ watches.

We can represent this information in an equation as:

39.99*A+59.99*B=1619.66...(2)

We will use substitution method to solve our system of equations.

From equation (1) we will get,

A=34-B

Substituting A=34-B in equation(2) we will get,

39.99*(34-B)+59.99*B=1619.66

1359.66-39.99*B+59.99*B=1619.66

-39.99*B+59.99*B=1619.66-1359.66

20*B=260

B=\frac{260}{20}

B=13

Therefore, the organisation purchased 13 heart-rate watches of brand B.

Now let us substitute B=13 in equation (1).

A+13=34

A+13-13=34-13

A=21

Therefore, the organisation purchased 21 heart-rate watches of brand A.

8 0
3 years ago
Solve the proportion W over thirty-six = five over eighteen.
storchak [24]

Answer:

W=10

Step-by-step explanation:

\frac{W}{36}=\frac{5}{18}

multiply both sides by 36

W=10

8 0
2 years ago
an ice cream stand sells chocolate, vanilla, strawberry ice cream as well as a choice of 22 toppings. How many choices are there
stiks02 [169]
If you choose Vanilla, there are 22 choices of toppings. 
If you choose Chocolate, there are 22 choices of toppings. 
If you choose Strawberry, there are 22 choices of toppings. 

22+22+22 = 66 

Therefore, there are 66 choices of toppings. 
8 0
3 years ago
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