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3 years ago

11

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalen

t to x from the second guionis
Into the first equation
tud
3x +2y-21
x - 3y - 4

1 answer:

MArishka [77]3 years ago

8 0

Answer:

all work is shown and pictured

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Selma uses a jogging trail that runs through a park near her home. The trail is a loop that is of a mile long. On Monday, Selma

qwelly [4]

Answer:

a) Her rate is 1 mile per hour for Monday’s run

b) 0.447 m/second

c) In fraction 20467m/180000 seconds

Step-by-step explanation:

Speed = distance / time = 1 mile/ 1 hour

= 1 mile per hour

Her rate is 1 mile per hour for Monday’s run

part A. According to the question, the unit rate is to be expressed in miles per hour units.

Part B.

Speed = distance / time = 1 mile/ 1 hour

= 1 mile per hour

But 1 mile = 1609.34 m

and 1 hour = 3600 seconds

There fore

1 mile/ 1 hour = 1*1609.34/ 1*3600 seconds

= 0.447 m/second

Part C.

1 mile/ 1 hour =1609.34/ 3600 seconds

= 1609.34 * 100/100 * 1/3600 ( multiplying and dividing by 100 to remove the decimal)

= 160934/360000

= 20467m/180000 seconds

The first five multiples of 1 are 2,3,4,5,6,7,8, 9......

The LCM of 1 and 1 is 1

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2 years ago

Haala buys 13 identical shirts and 22 identical ties for 363.01.. The cost of a shirt is 15.35. Find the cost of a tie

AlladinOne [14]

Answer:

EACH TIE COSTS 7.43

Step-by-step explanation:

If 13.35x13=173.55 then that means the ties total is 189.46 now devide that by 22 it equals 13.35

4 0

3 years ago

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

UNO [17]

Answer:

-10.6 and ⁹/₁₀

Step-by-step explanation:

The constants are the numbers that stand by themselves: -10.6 and ⁹/₁₀.

The <em>variables</em> are m and n.

The <em>coefficients</em> are the numbers in front of the variables: ⅖, 2.4, and 3.

7 0

3 years ago

Kelly is knitting a scarf for her brother. It took her 2/3 hour to knit 5/6 foot of the scarf. How fast is Kelly's knitting spee

juin [17]

Answer:

C. 4/5 feet per hour

Step-by-step explanation:

All you wanna do is to divide 2/3 and 5/6

then you'll have 4/5

Hoped this helps!

4 0

3 years ago

luis wants to buy a skateboard that usually sells for $79.99. all merchandise is discounted by 12%. what is the total cost of th

aivan3 [116]

<u>ANSWER: </u>

The total cost of the skate board is $74.61.

<u>SOLUTION: </u>

Given, Luis wants to buy a skateboard that usually sells for $79.99. all merchandise is discounted by 12%. luis has to pay a state sales tax of 6.75%.

We need to find what is the total cost of the skateboard.

Final cost is nothing but original amount subtracted by discount and added with tax.

final cost = original cost – discount + sales tax

Original cost = $79.99

Discount = 12% of original cost

$\begin{array}{l}{=12 \% \times 79.99} \\\\ {=\frac{12}{100} \times 79.99} \\\\ {=\frac{959.88}{100}} \\\\ {=9.5988}\end{array}$

discount is $9.6 approximately

Sales tax = 6% of cost after discounting

$\begin{array}{l}{=6 \% \times \text { (original cost - discount) }} \\\\ {=\frac{6}{100} \times(79.99-9.6)} \\\\ {=\frac{6}{100} \times(70.39)} \\\\ {=\frac{422.34}{100}} \\\\ {=4.2234}\end{array}$

Sales tax is $4.22 approximately

Now, final cost = 79.99 – 9.6 + 4.22

= 84.21 - 9.6

= 74.61

Hence, the total cost of the skate board is $74.61

6 0

3 years ago