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2 years ago

Solve the equation 40 = 2x^2+ 2x by factoring. What are the solutions?

Mathematics

2 answers:

Nimfa-mama [501]2 years ago

7 0

Answer:

x=4, -5

Step-by-step explanation:

Factor and set each factor equal to zero

jeka57 [31]2 years ago

7 0

Answer:

X = -4 , x= 4

Step-by-step explanation:

20=x^2-x=0

-20+x^2+x=0

x^2+x-20=0

x×(x+5)-4(x+5)=0

(x+5)×(x-4)=0

x+5=0

×-4=0

x=-5

x=4

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A random sample of cats at the SPCA shows that 25 out of the 40 cats are kittens. There are a total of 800 cats at all the anima

Alinara [238K]

Answer: The number of kittens= 500.

Step-by-step explanation:

Given, A random sample of cats at the SPCA shows that 25 out of the 40 cats are kittens.

i.e. ratio of kitten to cats = $\dfrac{25}{40}=\dfrac{5}{8}$

We assume that , the ratio will remains same.

Let x be the number of kitten out of 800 , then we have

$\dfrac{x}{800}=\dfrac{5}{8}\\\\\Rightarrow\ x=\dfrac{800\times5}{8}=500$

Hence, the number of kittens out of 800 cats= 500.

7 0

3 years ago

How many thirds are in - 4 2/3

lisov135 [29]

There are 14 thirds in 4 2/3

5 0

3 years ago

PLEASE HELP i have less than 20 mins left

gulaghasi [49]

3a) Answer: 84 degrees

Step-by-step explanation:

3x + 2(x+20)= 180 (total sum of angles in a triangle is 180 degrees)

5x+40 = 180

5x = 140

x= 28

3x= 28 x 3

= 84

3 0

2 years ago

Two burgers and one hotdog cost $4.82. At the same price ,one burger and two hotdogs cost $3.70. How much does a hotdog cost?

STatiana [176]

Hello!

Let's use 'x' to represent the cost of the burger, and 'y' to represent the cost of the hotdog.

2x + y = 482

× + 2y = 370

2x + 47 = 740

-3y = -258

y = 86 cents

2x + 86 = 482

2x = 396

x = 198

A burger costs $1.98 and a hot dog costs $.86

I hope this didn't confuse you, I'm not very good at explaining!

8 0

3 years ago

What is the value of p? (p 2)−4=14

Over [174]

P+2-4=14
p-2=14
add 2
p+2-2=14+2
p+0=16
p=16

8 0

3 years ago