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3 years ago

- 7x² + 2 + 12x – 14 - 10x?

Mathematics

2 answers:

Alisiya [41]3 years ago

6 0

I'm not sure what you're asking but if you're looking for simplification, here it is. -7x² + 2x - 12

Marrrta [24]3 years ago

4 0

Answer:

2x-61

Step-by-step explanation:

12x-10x-7^2+2-14

2x-7^2+2-14

2x-7^2-12

2x-49-12

2x-61

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Andrew and Sarah are tracking the number of steps they walk. Andrew records that he can walk 6000 steps in 50 minutes. Sarah wri

Leni [432]

Answer:

Andrew walks more steps than Sarah.

Step-by-step explanation:

The question is incomplete. The complete question is :

Andrew and Sarah are tracking the number of steps they walk. Andrew records that he can walk 6000 steps in 50 minutes. Sarah writes the equation y=118x, where y is the number of steps and x is the number of minutes she walks, to describe her step rate. This week, Andrew and Sarah each walk for a total of 5 hours. Who walks more steps?

Solution:

Given:

Andrew walks 6000 steps in 50 minutes.

Number of steps Sarah walks is given by the equation :

$y=118x$

where $y$ is the number of steps and $x$ is the number of minutes she walks.

Finding the number of steps each walks in 5 hours.

Total number of minutes in 5 hours = $5\times 60 = 300\ min$

For Andrew:

Using unitary method:

If in 50 minutes Andrew walks = 6000 steps.

In 1 minute he will walk = $\frac{6000}{50}$ = 120 steps

In 300 minutes he will walk = $120\times 300 = 36000$ steps

Thus, Andrew will walk 36,000 steps in 5 hours.

For Sarah:

We will plugin $x=300$ in the equation and solve for $y$ .

We have:

$y=118(300)$

∴ $y=35400$

Thus, Sarah will walk 35,400 steps in 5 hours.

Therefore, Andrew walks more steps than Sarah as $36,000>35,400$ .

5 0

3 years ago

One day, a person went to a horse racing area. Instead of counting the number of humans an horses, he conuted 74 heads and 196 l

BigorU [14]

X = the number of humans and y = the number of horses.

x+y=74
2x+4y=196

Because the number of humans and horses together is 74, and the total number of legs (2 per every human, x, and 4 per every horse, y) is 196. Then, just use elimination to solve.

$-2(x+y=74)\\2x+4y=196\\\\-2x-2y=-148\\2x+4y=196\\\\2y=48\\y=24$

So, now that you have y, you can plug it into the first equation to find x:

$x+y=74\\x+24=74\\x=50$

So, x = 50 and y = 24, so there are 50 humans and 24 horses.
The correct answer is B.

4 0

3 years ago

Pls follow the steps on the image

Darina [25.2K]

Answer:

-4

Step-by-step explanation:

7 0

3 years ago

Is the function y = 6 + 9 linear or nonlinear?

Luba_88 [7]

Answer:

Linear

Step-by-step explanation:

6 0

3 years ago

A quadratic equation of the form 0 = ax2 + bx + c has one real number solution. Which could be the equation?

Fynjy0 [20]

Answer:

The equation showing this situation is $D=b^2-4ac=0$

Step-by-step explanation:

Given : A quadratic equation of the form $ax^2 + bx + c=0$ has one real number solution.

To find : Which could be the equation?

Solution :

A quadratic equation in form $ax^2+bx+c=0$ has a solution $x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$ called a quadratic formula in which the roots are one real,two real or no real is determine by discriminant factor.

Discriminant is defined as to determine the number of roots in a quadratic equitation has following rules :

1) If $D=b^2-4ac>0$ there are two real roots.

2) If $D=b^2-4ac=0$ there are one real roots.

3) If $D=b^2-4ac$ there are no real roots.

According to question,

A quadratic equation of the form $ax^2 + bx + c=0$ has one real number solution.

So, The equation showing this situation is $D=b^2-4ac=0$

6 0

3 years ago