All categories

3 years ago

2,99,790,000 in scientific notation

Mathematics

1 answer:

ludmilkaskok [199]3 years ago

3 0

So we have 299790000, we want to have only one digit in front of the decimal, 2.9979x10^9

hope this helps :)

You might be interested in

The answer that is selected is just a guess

Semmy [17]

The answer it’s 4, hope it helps

4 0

2 years ago

PLSSS HELPP SOOON BRAINLIESTTT

garik1379 [7]

Answer:

1: A) 12 meters

2: B) 225 = (12 + x)(14 + x)

Step-by-step explanation:

42 times 2 = 84

84/12 = 7

(To check) 12 - 7 = 5

I'll be expecting that brainliest :)

6 0

3 years ago

Evalute the expression. 80 + (8x4) divided by 2

dexar [7]

Answer:

If you meant [80 + (8*4) ]/2, then [80 + (8*4) ]/2=56

or if you meant 80 + [ 8*4 / 2], then 80 + [ 8*4 / 2] = 96

Step-by-step explanation:

Evalute the expression. 80 + (8x4) divided by 2

so do you mean

the whole expression 80 + (8x4) is over 2 ?

If so then:

evaluate 8x4 = 8 * 4 = 32.

so we have 80 + (8x4) is over 2 = (80 + 32)/2 = 112/2 = 56

If you meant 80 + [ 8*4 / 2]

then 80 + [ 8*4 / 2] = 80 + 8*2 = 80 + 16 = 96

4 0

3 years ago

Read 2 more answers

Estimate the solution to the system of equations 7x−y=7 x+2y=6 i need help

Yanka [14]

Answer:

(4/3, 7/3)

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

Algebra I

Terms/Coefficients
Coordinates (x, y)
Solving systems of equations of using substitution/elimination

Step-by-step explanation:

Step 1: Define Systems

7x - y = 7

x + 2y = 6

Step 2: Rewrite Systems

Equation: x + 2y = 6

[Subtraction Property of Equality] Subtract 2y on both sides: x = 6 - 2y

Step 3: Redefine Systems

7x - y = 7

x = 6 - 2y

Step 4: Solve for y

Substitution

Substitute in x: 7(6 - 2y) - y = 7
Distribute 7: 42 - 14y - y = 7
Combine like terms: 42 - 15y = 7
[Subtraction Property of Equality] Subtract 42 on both sides: -15y = -35
[Division Property of Equality] Divide -15 on both sides: y = 7/3

Step 5: Solve for x

Define original equation: x + 2y = 6
Substitute in y: x + 2(7/3) = 6
Multiply: x + 14/3 = 6
[Subtraction Property of Equality] Subtract 14/3 on both sides: x = 4/3

7 0

3 years ago

Prove that sinxtanx=1/cosx - cosx

maks197457 [2]

Answer:

See below

Step-by-step explanation:

We want to prove that

$\sin(x)\tan(x) = \dfrac{1}{\cos(x)} - \cos(x), \forall x \in\mathbb{R}$

Taking the RHS, note

$\dfrac{1}{\cos(x)} - \cos(x) = \dfrac{1}{\cos(x)} - \dfrac{\cos(x) \cos(x)}{\cos(x)} = \dfrac{1-\cos^2(x)}{\cos(x)}$

Remember that

$\sin^2(x) + \cos^2(x) =1 \implies 1- \cos^2(x) =\sin^2(x)$

Therefore,

$\dfrac{1-\cos^2(x)}{\cos(x)} = \dfrac{\sin^2(x)}{\cos(x)} = \dfrac{\sin(x)\sin(x)}{\cos(x)}$

Once

$\dfrac{\sin(x)}{\cos(x)} = \tan(x)$

Then,

$\dfrac{\sin(x)\sin(x)}{\cos(x)} = \sin(x)\tan(x)$

Hence, it is proved

5 0

3 years ago