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3 years ago

How do I work out PEMDAS

2 answers:

5 0

P: Parentheses
E: Exponents
M: Multiplication
D: Division
A: Addition
S: Subtraction
Another way to remember it is: Please Excuse My Dear Aunt Sally

MrMuchimi3 years ago

3 0

Do what in the parenthesis first then solve the exponents then divide what has to be divided and then add and finally subtract

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What are the solutions to the equation -5x2 + 3x = -9

Aleks04 [339]

Answer: Move terms to the left side−52+3=−9−5x2+3x=−9−52+3−(−9)=0−

Common factor−52+3+9=0−5x2+3x+9=0−(52−3−9)=0

Divide both sides by the same factor−(52−3−9)=0−(5x2−3x−9)=052−3−9=0

Solution=3±321 over 10

Step-by-step explanation:

7 0

2 years ago

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John has decided to prepare an old field for his son's new horse. the length of the field is 10 meters less than 4 times its wid

tatuchka [14]

Answer: The total money invested in the field will be $1,623.80

Step-by-step explanation:

step 1

Find the dimensions of the field

Let

x -----> the length of the field

y -----> the width of the field

p=2(x+y)

p(4.80)=1,584

p=330m

we know that

The perimeter of the field is equal to

330=2(x+y)----> equation A

x=4y-10 ------> equation B

substitute equation B in equation A and solve for y

330=2(4y-10+y)

165=(5y-10)

5y=165+10

y+35

Find the value of x

x=4(35)-10+130

therefore

The length of the field is 130 meters and the width of the field is 35 meters

step 2

Find the area of the field

The area of the field is

A=xy

substitute

A=(130)(35)=4,550m2

step 3

Find the number of bags of seed

Divide the area by 460

4,550/460=9.89 bags

Round up to the nearest whole number

9.89 bags=10 bags

step 4

Find the cost of the seed

(10 )(3.98)=$19.8

step 5

Find the total money invested in the field

1,584+$39.8=$1,623.80

7 0

2 years ago

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How can you use rates of change to solve a real-life problem like the excessive emission of CO2 in the air? Answer using correct

Norma-Jean [14]

Answer:

rate of change can be used in a real life problem such as the rate that a pool fills up with water.

8 0

2 years ago

How do you find X and Y?<br> 4y + 5z = 60<br> 5x + 3y = 60<br> 4x + 3z = 60

oee [108]

Answer:

1. y=5 x=8

2. x=9 y=5

3. x=12 z=4

Step-by-step explanation:

1. 4(5)+5(8)=60

2. 5(9)+3(5)=60

3. 4(12)+3(4)=60

6 0

3 years ago

The admission fee for a charity event is $7 for children and $10 for adults. The event was attended by 700 people, and the total

maria [59]

If all were children, revenue would be 700*$7 = $4900. Revenue is actually $6400 -4900 = $1500 more than that. Each adult admission that replaces a child's admission adds $10 -7 = $3 to the revenue, so there must have been
$1500/$3 = 500 . . . . adult admissions

There were 200 children at the show.
There were 500 adults at ths show.

6 0

3 years ago

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