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3 years ago

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