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3 years ago

Which operation should be done first to find the value of the expression: 18 + 5 x 42 = 2

Mathematics

2 answers:

AysviL [449]3 years ago

8 0

Answer:

Multiply 5 x 42

Step-by-step explanation:

Remember the acronym PEMDAS

Parentheses

Exponents

Multiple

Divide

Add

Subtract

Because there are no parentheses or exponents you should multiply first.

Neko [114]3 years ago

6 0

Answer:

Multiplication

Step-by-step explanation:

P = Parentheses

E = Exponents

M/D = Multiplication/Division

A/S = Addition/Subtraction

If you have both multiplication/division or addition/subtraction left, ALWAYS work left to right.

Since there are no parentheses or exponents you do the multiplication first

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A 3” x 5” photo is enlarged so that the length of the new photo is 7 inches. Find the width of the new photo.. a. 4.20 inches. c

Andrej [43]

As far as the old dimensions of the photo are concerned,
Width of the photo = 3"
Length of the photo = 5"
New length of the photo = 7 inches
Let us assume the new width of the photo = x inches
Then
3/5 = x/7
5x = 7 * 3
5x = 21
x = 21/5
= 4.20 inches
So the correct option among all the options that are given in the question is the first option. I hope that the answer has come to your help.

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3 years ago

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yKpoI14uk [10]

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Step-by-step explanation:

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I don’t get this one please HELPPP MEE

iren2701 [21]

Answer:

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Step-by-step explanation:

The given expression is

$\frac{2 {x}^{2} }{x} +x(100 - 15x)$

From the question, x=5

So,by substitution,we obtain

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$=\frac{2(25)}{5} +5(100 - 75))$

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2 years ago

What is 3n-2/5=7/10 solve please

Tems11 [23]

Answer: $\bold{n=\dfrac{11}{6}}$

<u>Step-by-step explanation:</u>

$\dfrac{3n-2}{5}=\dfrac{7}{10}\\\\\\10(3n-2)=5(7)\qquad \longrightarrow \quad \text{(cross multiplied)}\\\\30n-20=35\qquad \longrightarrow \quad \text{(distributed)}\\\\30n=55\qquad \longrightarrow \quad \text{(added 20 to both sides)}\\\\n=\dfrac{55}{30}\qquad \longrightarrow \quad \text{(divided 30 from both sides)}\\\\n=\dfrac{11}{6}\quad \longrightarrow \quad \text{(simplified fraction)}\\\\\\\large\boxed{n=\dfrac{11}{6}}\\$

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