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3 years ago

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:

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