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Stella [2.4K]
1 year ago
8

Marika is training for a track race. She start sprinting by 100 yards. She gradually increases her distance, adding 4 yards a da

y for 21 days. the explicit formula that models this situation is an=100+(n-1)4. how far does seh sprint on day 21
Mathematics
1 answer:
Hunter-Best [27]1 year ago
8 0

Answer:

  180 yards

Step-by-step explanation:

The number of yards she sprints on day 21 can be found by evaluating the formula with n=21.

<h3>Solution</h3>

  a21 = 100 +(21 -1)4 = 100 +(20)(4) = 100 +80 . . . . . use 21 in place of n

  a21 = 180

Marika sprints 180 yards on day 21.

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13. For what value of b would the following system of equations have an infinite number of solutions?
tiny-mole [99]

Answer:

b=2

Step-by-step explanation:

we have

9x+12y=21 -----> equation A

6x+8y=7b ----> equation B

we know that

If the system of equations have an infinite number of solutions then the equation A must be equal to the equation B

Multiply equation B by 1.5 both sides

1.5*[6x+8y[=7b*1.5

9x+12y=10.5b ----> equation C

Compare equation A and equation C

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9x+12y=10.5b ----> equation C

For the equations to be equal it must be fulfilled that

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5 0
3 years ago
Someone please help me this is due tomorrow!!!​
Murljashka [212]

Let me know if you can see this photo

3 0
3 years ago
I NEED HELP ASAP
Maru [420]

Answer:

1x + 4y = 4 ⇒ 6x + 24y = 24

6x -  8y = 0 ⇒ 6x -   8y = 0  

                              32y = 24

                               32     32

                                  y = 3/4

                    x + 4(3/4) = 4

                           x + 3 = 4

                               -3   -3

                                x = 1

                           (x, y) = (1, 3/4)

Step-by-step explanation:

up there :D

4 0
1 year ago
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