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3 years ago

SOMEONE PLEASE HELP ME WITH MATH! WILL GIVE BRAINLIEST TO FIRST PERSON WHO ANSWERS!!

1 answer:

7 0

1. -5x-8(-3)=9
-5x+24=9
-5x=-15
x=3
(3,-3)

2. -6x-2(-3x)=3
-6x+6x=3
0=3
No solution

3. 6x+5(-8x+2)=10
6x-40x+10=10
-34x+10=10
-34x=0
x=0
y=-8(0)+2
y=2
(0,2)

4. 6x+2(-3x-3)=-6
6x-6x-6=-6
-6=-6
Infinitely many solutions

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2. A racecar has a mass of 1500 kg. What is its KE in joules if it has a speed of 110 km/hr?

sertanlavr [38]

Answer:

7.0 × 10^5 J

Step-by-step explanation:

First we convert the speed of 110 km/hr to metre-per-seconds

v = 110×(1000/3600)

v = 30.56 m/s

m = 1500 kg

$kinetic \: energy \: = \frac{1}{2} m {v}^{2}$

= 0.5 × 1500 × (30.56)²

= 700231.5

= 7.0 × 10^5 J

7 0

3 years ago

Starting at 1:00 p.M., The temperature changes -4 degrees Fahrenheit per hour. Write and solve an equation to find how many hour

shutvik [7]

Answer: it will take 5 hours to reach -1 °F.

Step-by-step explanation:

The temperature changes -4 degrees Fahrenheit per hour. This is a linear rate. The rate at which the temperature is decreasing is in arithmetic progression. The formula for determining the nth term of an arithmetic sequence is expressed as

Tn = a + (n - 1)d

Where

a represents the first term of the sequence(the starting point)

d represents the common difference.

n = x = the number of terms in the sequence(number of hours)

From the information given,

a = 0(at 1 pm, number of hours is 0)

d = - 4 degrees (it is decreasing)

Tn = -1 °F.

We want to determine the number of hours, x when Tn = -1 °F

Therefore,

- 1 = 0 + (x - 1)- 4

- 1 = - x + 4

x = 4 + 1

x = 5 hours

8 0

4 years ago

If the volume of the cube was 27 (each side length is 3 units), what would the new volume be if each side length of the cube was

Nat2105 [25]

clapped

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

What is the minimum value of F(x)= 10x^{2} -6x-3<br> 3/10 or -39/10

kolezko [41]

Answer: 3/10

Step-by-step explanation:

Take the derivative of $10x^2-6x-3$ to get $20x-6$ . Set that equal to 0 to find the critical points of the function. The critical points is when the slope is either 0 or undefined.

Now do:

$20x-6=0\\20x=6\\x=\frac{6}{20} = \frac{3}{10}$

There are quite a few more steps to actually find the minimum, but for this example you can automatically assume its a minimum because it is the only critical point of the function. Ill show you these extra steps tho.

Plug in two numbers into the derivative. One that is less than 3/10 and one that is greater than 3/10. The numbers 0 and 1 are fine. When x = 0, the function is -6. When x = 1, the function is +14. A switch from negative to positive indicates a minimum value

6 0

3 years ago

Sketch y= -2x - 4x - 5

Vikki [24]

I think it is...... -6x-5

8 0

4 years ago

Read 2 more answers