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solmaris [256]
2 years ago
15

What do you need to do to add and subtract decimals?

Mathematics
2 answers:
olga nikolaevna [1]2 years ago
6 0

Answer:

Write down the numbers, one under the other, with the decimal points lined up

Put in zeros so the numbers have the same length

Then add using column addition, remembering to put the decimal point in the answer

Step-by-step explanation:

Elza [17]2 years ago
6 0
Line up decimals and add/subtract no different then when you’re adding and subtracting normal numbers
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Given f(x) = the quantity of 4x plus 1, divided by 3 <br> solve for f-1(3).
algol13
First we need to find inverse function of f(x) which is written in a form of (f(x))^(-1)
That means that we are actually looking for function f(y) and we need to solve this equation for "y"

y=(4x + 1)/3
3y = 4x + 1
4x = 3y - 1
x = (3y - 1) / 4
f(y) = (3y - 1)/4

Now we simply put the value of 3 instead of y and find the answer:
f(y=3) = (3*3-1)/4 = 2

Answer is 2
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2 years ago
A class has 4 boys and 10 girls. What is the ratio in simplest form that compares number of boys to total number of students?
Colt1911 [192]

Answer:

2:7

Step-by-step explanation:

There are 4 boys and 14 total students (# of boys + # of girls). Therefore, the ration that compares boys to total number of students is 4:14 which is 2:7 in simplest form.

Hope this helps :)

4 0
2 years ago
Given p(x)= 3x+1 and r(x)= 2x^2+5 which of the following represents the composition p(r(x)) ?
Temka [501]

Step-by-step explanation:

substitute the values

px=3x+1

=(3x+1)/x

=3x/x +1/x

=3+1/x

rx=2x²+5

p(r(x)) =(3+1/x(2x²+5))

=6x²+15+2x²/x+5/x

=3(2x²+5)+1/x(2x²+5)

=(2x²+5)(3+1/x)

6 0
2 years ago
Suppose that the local sales tax rate is 6.25% and you purchased a used car for $16,800. What is the car’s total cost?
Tanzania [10]
Total= Car Cost + (Car Cost * Tax %)

Total= $16,800 + ($16,800 * 6.25%)
convert % to decimal form; divide % by 100

Total= $16,800 + ($16,800 * 0.0625)
multiply inside parentheses

Total= $16,800 + $1,050

Total= $17,850


ANSWER: The total cost for the used car with tax is $17,850.

Hopd this helps! :)
7 0
3 years ago
Read 2 more answers
Eight less than the product of 2 and a number x ?
mars1129 [50]
Eight less than the product of 2 and a number x is: 2x-8
4 0
2 years ago
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