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finlep [7]
2 years ago
10

An arrangement of marbles has 12 marbles in the first row and 10 rows in all. In each successive row one marble is added.What is

the explicit rule for this situation, and how many marbles will be in the 10th row?Drag and drop the answers into the boxes to match the situation.Explicit ruleNumber of marbles in the 10th rowAn = 11 + 11n, An = 12 + n, An = 11 + n, An = 12 + 10n, 19, 20, 21,
Mathematics
2 answers:
sergiy2304 [10]2 years ago
6 0

Answer:

A(n)=11+n

Step-by-step explanation: took test

bogdanovich [222]2 years ago
5 0

The explicit rule for the number of marbles in 10th row is An= 12+ n-1.

<u>Step-by-step explanation</u>:

  • Total number of rows = 10 rows
  • The number of marbles in the 1st row = 12 marbles
  • One marble is added to each successive row

Therefore, for the remaining 9 rows out 10 rows ⇒ 9 marbles are added.

  • The number of marbles in the 10th row = 12+9 = 21 marbles.
  • The explicit rule is An = 12 + n-1

For n= 10, then

⇒ A10 = 12 + (10-1)

⇒ A10 =12+9 = 21

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$0.28

Step-by-step explanation:

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3 years ago
An athlete knows that when she jogs along her neighborhood​ greenway, she can complete the route in 10 minutes. It takes 20 minu
IgorLugansk [536]

Answer:

10 miles per hour.

Step-by-step explanation:

Let x represent athlete's walking speed.

We have been given that her jogging rate is 5 mph faster than her walking​ rate, so athlete's jogging speed would be x+5 miles per hour.

\text{Distance}=\text{Rate}\cdot \text{Time}

10 minutes = 1/6 hour.

20 minutes = 1/3 hour

While walking, we will get D_{\text{walking}}=x\frac{\text{miles}}{\text{hour}}\cdot \frac{1}{3}\text{hour}

D_{\text{walking}}=\frac{x}{3}

While jogging, we will get D_{\text{jogging}}=(x+5)\frac{\text{miles}}{\text{hour}}\cdot \frac{1}{6}\text{hour}

D_{\text{jogging}}= \frac{(x+5)}{6}

Since athlete is covering same distance while walking and jogging, so we can equate both expressions as:

\frac{x}{3}=\frac{x+5}{6}

Cross multiply:

6x=3x+15

6x-3x=15

3x=15

\frac{3x}{3}=\frac{15}{3}\\\\x=5

Therefore, athlete's walking speed is 5 miles per hour.

Jogging speed: x+5\Rightarrow 5+5=10

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3 0
3 years ago
Write a real world problem that you could represent with the equation 20 - n = 4. Solve the equation to find the answer to your
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6 0
3 years ago
Read 2 more answers
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Vesnalui [34]

Answer:

y = -x + 2.

or

x + y - 2 = 0 (Standard form).

Step-by-step explanation:

Its slope (m) is -1 and y intercept (c) is at y = 2.

y = mx + c

So it's:

y = -1x + 2

Standard form is:

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5 0
2 years ago
A map has a scale of 3 cm and 20 cm which statement is true or false two cities are actually 66 cm part are9.9 cm part
victus00 [196]
Answer:
Answer options
A. Two cities that are 7.5 cm apart on the map are actually 50 km apart.
D. Two cities that are actually 66 km apart are 9.9 cm apart on the map.
Step-by-step explanation:
Step 1
Indicate the scale as shown;
3 cm : 20 km, meaning 3 cm on the map represents 20 km on the ground
A). what does 7.5 cm represent on the ground
Distance on ground=(7.5×20)/3=50 km
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D). what does 66 km on ground represent on the map
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