All categories

3 years ago

2r-7=-1. Help please thanks

Mathematics

1 answer:

UkoKoshka [18]3 years ago

6 0

Answer:

-3

Step-by-step explanation:

You might be interested in

a wire of length 200 cm is cut into two parts and each part is bent to form a square.If the area of the larger square is 9 times

diamong [38]

Answer:

The perimeter of the larger square is $150cm.$

Step-by-step explanation:

First of all, let one part of it be " $x$ "

and the other part of it " $200-x$ "

Now to solve this :

The area of the square = $L^2$

The area of one part of the square = $x^2$

The area of the other part of the square = $(200-x)^2$

$9x^2= (200-x)^2\\9x^2=40000-400x+x^2$

Now, add, $-4x^2$ to both the sides :

$9x^2-9x^2=40000-400x+x^2-9x^2\\-1(8x^2+400x-40000)=0$

Now, take out the "8" which is common :

$-8(x^2+50x-5000)=0$

Now, divide it by $-8$ :

$x^2+100x-50x-5000=0\\x(x+100)-50(x+100)=0\\(x+100)(x-50)=0\\$

$x=-100$ or $50$

So, now we know that :

One of the part is = $50cm$

And the other part is = $150cm$

Thus the perimeter of the larger square is = $150cm$

3 0

3 years ago

Which expression, when simplified, is equal to 7p

Sphinxa [80]

Um I dont know the specific expression. But I think one of them would be 6p + 1p = 7p. I know its really simple but its kinda right. Hope I can help. Sorry If im wrong

6 0

3 years ago

Put a check by all the factors of 20. 24,2,4,3,6,12,1,8

iren [92.7K]

2**

4**

1**

the ones i chose are correct

(1,20),(2,10),(4,5)

8 0

3 years ago

A man earned £6500 for the month. He paid 2/5 in tax . How much did he have left to spend?

grin007 [14]

Answer:

$2600

Step-by-step explanation:

Im not too fond of the conversion of Pounds and USD. But if it were USD 2/5 of the amount would be $2600

6 0

2 years ago

Zack used these steps to solve this equation: Three-fourths y + 5 = negative three-fourths y minus 9. Step 1: StartFraction 6 Ov

frez [133]

Answer:

Step-by-step explanation:

ur welcome

5 0

3 years ago

Read 2 more answers