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3 years ago

Which operation has to be calculated first in this expression? 7 – (4 + 5)

Mathematics

2 answers:

d1i1m1o1n [39]3 years ago

8 0

Answer:

Addition

Step-by-step explanation:

You should add 4 and 5 first because of PEMDAS.

Parentheses

Exponents

Multiplication

Division

Addition

Subtraction

Since 4+5 is in parentheses it should be done first.

katovenus [111]3 years ago

4 0

Answer:

Addition

Step-by-step explanation:

This the answer because:

1) First, we have to know the Order of Operations

2) An easy way of remembering this is PEMDAS or GEMS

PEMDAS : Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction

GEMS : Grouping (Parenthesis), Exponents, Multiplication and Division (whichever one comes first from left to right), Addition and Subtraction (whichever one comes first from left to right)

3) In this expression, parenthesis would be first because that's what comes first in the order of operations

4) Inside the parenthesis is another expression where you need to add. Therefore, the answer is addition

Hope this helps!

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Drupady [299]

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3 years ago

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Sunny_sXe [5.5K]

Answer:

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Step-by-step explanation:

Plug y=7x+4 into your graphic caculator

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3 years ago

A $10 shirt was sold for $16. What was the percent of change?

zloy xaker [14]

Answer:

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Step-by-step explanation:

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3 years ago

ANSWER ASAP x+4.5 x= 1.2 A: 3.3 B: 6.7 C: 5.7

swat32

Answer:

C.5.7

Step-by-step explanation:

plug in the x value then add 4.5 to 1.2 and booyyah

6 0

3 years ago

You collect pennies. you start with one penny and double the number of pennies you have each day for the next 27 days. how many

Rudik [331]

Imagine, at the first day you have only one penny. Then tomorrow you have 2 pennies, next day you have 4 (2x2), next day you have 8 (4x2), next day you have 16 (8x2).... and so forth.

It looks like geometric sequence isn't it? (the ratio between the number of pennies that you have from the 2nd day and the 1st day is 2)

So, by using geometric sequence theorem we can total those pennies until day-27

S (total pennies at day-27) = (1)(2^27-1) / 2-1 = 2^26 pennies

So, you have 2^26 pennies.. a big number of pennies huh?=))

{The formula is: S = a( r^n-1) / r-1
Where:
a= the number of pennies that you've got at the 1st day
n= number of days you spent to collect those pennies)
r= the ratio of the number of pennies}

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3 years ago