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3 years ago

For EASY BRAINLIEST!!! Please help.

Mathematics

1 answer:

Anon25 [30]3 years ago

3 0

Step-by-step explanation:

Let x be the number

6+4x=42

4x=36

x=9

!!!!!!!

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During a certain day, a worker made 81 parts. He usually does 45 parts per day. What was the percent by which he increased the n

Lana71 [14]

Answer:

The answer is 80%.

Step-by-step explanation:

During a certain day, a worker made 81 parts.

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4 years ago

DEF is a right angled triangle calculate the length of EF correct to 3 sigificant figures

Vesnalui [34]

Answer:

$\displaystyle EF \approx 15.9$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Multiplication Property of Equality
Division Property of Equality
Addition Property of Equality
Subtraction Property of Equality

Trigonometry

[Right Triangles Only] SOHCAHTOA
[Right Triangles Only] cosθ = adjacent over hypotenuse

Step-by-step explanation:

Step 1: Define

Angle θ = 28°

Adjacent Leg = EF = x

Hypotenuse = DF = 18

Step 2: Solve for x

Substitute in variables [Cosine]: $\displaystyle cos28^\circ = \frac{x}{18}$
[Multiplication Property of Equality] Multiply 18 on both sides: $\displaystyle 18cos28^\circ = x$
Evaluate trig: $\displaystyle 18(0.882948) = x$
Multiply: $\displaystyle 15.8931 = x$
Rewrite: $\displaystyle EF = 15.8931$
Round: $\displaystyle EF \approx 15.9$

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3 years ago