MATHEMATICS HIGH SCHOOL

Which expression is equivalent to -1?A) -
x + y
x - y
B) -
x - y
-x + y
C) -
x - y
-x - y
D) -
x + y
-x + y

Answers

Answer 1
Answer: Hello,
Answer B

If x≠y then
(x-y)/(-x+y)=(x-y)/(-(x-y))=-1

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Which expression is equivalent to 1/4 (4+9)? plssss help me I only have 20 minutes
Simplify the square root of 125

Help asap I only have 10 minutes!Heidi grew her hair out for many years. Her hair was 1 1/3 of a meter long. She donated her hair by cutting off 5/6of a meter.
How long is Heidi's hair now?

Answers

Answer:

Heidi's hair is only half a meter long now.

1/2 of a meter

Step-by-step explanation:

1 1/3 - 5/6

= 1 2/6 - 5/6

= 3/6

= 1/2

I hope this helped! Happy new year :)

Answer:

3/6 or 1/2 meter lomg.

Step-by-step explanation:

Solve each system using substitution.
3x+2y=23
1/2x-4=y

Answers

\left\{\begin{array}{ccc}3x+2y=23&(1)\ny=(1)/(2)x-4&(2)\end{array}\right\n\nsubtitute\ (2)\ to\ (1)\n\n3x+2((1)/(2)x-4)=23\n3x+x-8=23\n4x-8=23\ \ \ \ |add\ 8\ to\ both\ sides\n4x=31\ \ \ \ \ |divide\ both\ sides\ by\ 4\n\boxed{x=7.75}\n\nsubtitute\ the\ value\ of\
1: 3x+2y=23
2: 1/2x-4=y
We have that y=1/2x-4 in 2
So lets substitu y in 1
3x+2(1/2x-4)=23
3x+x-8=23
4x=23+8
4x=31
X = 7,75
Now lets replace x in 2:
1/2.7,75-4=y
3,875-4 + y
Y= - 0,125
So (x;y)=(7,75;-0.125)

What is -9/20 as a decimal and as a percent?

Answers

Decimal: -0.45 percent:-45%
To find out what a fraction as a decimal would be, you simply need to divide the numerator by the denominator.

(-9)/(10) = -9/10=-0.9

Now to find the percent.
To find a percentage based off of a decimal, we can either multiply the decimal by 100, or (my personal shortcut) just shift the decimal point over two places to the right.

-0.9 = -90%

which is all we need to know.

(-9)/(10) written as a decimal and a percent is -0.9 and -90% respectively.
Hope that helped! =)

Bubba can mow a field in 8 hours. If Skeeter helps, they both can do it together in 3 hours. How long would it take Skeeter to mow the field by himself?

Answers


When they work together, they do  1/3 of the job in one hour.

                   (Bubba) + (Skeeter) = 1/3 job/hour    

Subtract 'Bubba'
from each side:            Skeeter  =  (1/3 job/hour) - (Bubba)

Bubba, working alone, does  1/8 of the job in one hour.

                                      Skeeter  =  (1/3 job/hour) - (1/8 job/hour)

Can you subtract 1/8 from 1/3 ?

Before you can subtract, you'll need a common denominator.
I've got a nice one here . . .  24 .

                   1/3  =  8/24
                   1/8  =  3/24                                                         

                   Skeeter  =  (1/3 job/hour) - (1/8 job/hour)

                                  =  (8/24 job/hour) - (3/24 job/hour)

                                  =        5/24 job/hour .

Skeeter mows at the rate of  5/24 field/hour.

The other way to look at that is:     24/5 hour/field  =  4.8 hours .

Check:

         Bubba:     1/8     field per hour  =  0.125
         Skeeter:  1/4.8  field per hour  =  0.208333...     

         Together:                        (0.125 + 0.208333)

                                             =  0.333... field per hour

                                             =    3 hours/field .                  yay!

Natalie comprou amêndoas orgânicas por US$ 77 no supermercado. Quanto ela pagou ao caixa, se recebeu US$ 23 de troco

Answers