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Irina-Kira [14]
2 years ago
13

30, 400 in decimals​

Mathematics
2 answers:
aliya0001 [1]2 years ago
7 0

Answer:

30= .3    400= 4.0

Step-by-step explanation:

WARRIOR [948]2 years ago
4 0

Step-by-step explanation:

Could you further explain?

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Find the value of 3x + 4y when x = -2 and y = 4
lord [1]
-6x+16y................
3 0
3 years ago
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A number increased by two thirds of the number
Artyom0805 [142]

Answer:

not sure if you're looking for an example of this or not but if you are then it could be something like 12 + 8 because 2/3 of 12 is 8.

3 0
2 years ago
Solve the radical equation. Check all purpose solutions. <br><br> Sqrt(4-3x) = x
alisha [4.7K]

Step-by-step explanation:

√(4-3x) = x

1. square both sides:

[√(4-3x)]²= (x) ²

4-3x = x²

2. shift all the terms to the right side

(minimise dealing with negative coefficient of x² terms to prevent careless mistakes)

0= x²+3x-4

no matter how you change the places of the terms, it will still be:

x²+3x-4=0

3. solve the quadratic equation, either by cross multiplication(and factorising) or the quadratic formula(if you're taught)

for me I will be using the cross multiplication table that my calculator can help me with(gives me the solution but better to show the factorised form to prevent missing out method marks)

as such:

x²+3x-4=0

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

hence:

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

finally:

x= -4 or x= 1

however we're not done yet as some solutions may not match with the question/ original equation provided, this we still need to check if there are any values that does not match

substitute x= -4 into the original equation:

√4-3(-4) = √4+12 = √16 = 4 > -1 , hence x= -1 is not the answer

you can substitute the values into a scientific calculator(that has the functions required) to quickly determine

then to double confirm, do the same for the other value of X that we have found:

√4-3(1) = √4-3 = √1 = 1

since the other value of x matches with the equation provided in the question, then we can now confirm that the value of x=1 is the correct value

reason for such situation to happen:

remember in step 1 when we squared both sides of the equation, that is the reason for having to check for the correct X value. let me explain further

when we square numbers, we are potentially introducing another possible answer other than the correct answer intended for us to find as well as to match with the question.

for example:

1 = 1² = (-1)²

likewise, I can even take any other number to compare, such as 100:

100=10²=(-10)²

and this scenario only happens for the even powers of x, such as x², x⁴, x⁶ so on and so forth.

hence whenever such questions come out, do remember to double check with the original question/equation

lastly, the checking portion will only apply for even powers of x in questions and/or when you happen to square them

hope this helps!

5 0
1 year ago
It costs $7 each way to travel to work each weekday by train. What is the weekly expense each way?
lord [1]

Answer:

it could either be 35 or 70

Step-by-step explanation:

4 0
3 years ago
X + y = 4<br> 2x - 5y = 15<br> Graphing
sesenic [268]

Answer:

Step-by-step explanation:

5x + 5y = 20

2x - 5y = 15

7x = 35

x = 5

5 + y = 4

y = -1

(5, -1)

4 0
3 years ago
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