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jeyben [28]
3 years ago
13

Can someone help me with this question? I’ll mark as brainliest if correct!

Mathematics
2 answers:
Reika [66]3 years ago
7 0

Answer:

which diagram model the story

the answer is 1 b { 9 9 9 9 9 9 9 9 9

the first one

which equation models the story

the answer is b/10=9

please mark as brainliest

Travka [436]3 years ago
5 0
For both answers it is the second option
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Factor the quadratic equation below to reveal the solutions. X^2+4x-21=-9
a_sh-v [17]

Answer:

x = 3 and x = -7

Step-by-step explanation:

The given quadratic equation is x^2+4x-21=0. We need to find the solution of this equation.

If the equation is in the form of ax^2+bx+c=0, then its solutions are given by :

x=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}

Here, a = 1, b = 4 and c = -21

Plugging all the values in the value of x, such that :

x=\dfrac{-b+ \sqrt{b^2-4ac} }{2a},\dfrac{-b- \sqrt{b^2-4ac} }{2a}\\\\x=\dfrac{-4+ \sqrt{(4)^2-4\times 1\times (-21)} }{2(1)},\dfrac{-4- \sqrt{(4)^2-4\times 1\times (-21)} }{2(1)}\\\\x=3, -7

So, the solutions of the quadratic equation are 3 and -7.      

6 0
3 years ago
Sara ran 10km in 2.5 hours. Katerina ran 7.5 km in 2 hours. Candice ran 9.5 km in 2.25 hours. Who had the fastest average speed?
Arisa [49]

10 km ÷ 2.5 hours = 4 km/h — This is Sara's record

7.5 km ÷ 2 hours = 3.75 km/h — This is Katerina's record

9.5 km ÷ 2.25 hours = 4.2 km/h — This is Candice's record

Therefore, the answer is Candice had the fastest average speed.

6 0
4 years ago
A. Write 60,000,000 in words.
Vitek1552 [10]

Answer:

The answer is sixty million.

5 0
3 years ago
Marisa recorded the number of hours she babysat each day last summer. She plotted the data in the box plot. A number line goes f
il63 [147K]

Answer:

C

Step-by-step explanation:

6 0
4 years ago
Read 2 more answers
Helppp me Please!!!!! :)
irina [24]

Answer:

x = 30 \\ y = 10

Step-by-step explanation:

8x + 6y = 300 \\ x + y = 40 \\ 6x + 6y = 240 \\ 2x = 60   \\ =  > x = 30 \\ y = 10

7 0
3 years ago
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