2 years ago

Simplify the expression. (1423 – 2x2 + 3x – 7) – (328 + 142 – 10)

Mathematics

1 answer:

Lubov Fominskaja [6]2 years ago

3 0

Answer:

-2x^2+3x+956

Step-by-step explanation:

If you want to do math easier, just look up symbolab.com and it will show you the right answers and how to do the problems.

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5x + y = 6 5x + 3y = -4 The y-coordinate of the solution to the system shown is ___.

8_murik_8 [283]

Subtract these 2 equations,

5x-5x +3y-y = -4-6

2y = -10

y = -5

-5 is your answer.

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3 years ago

(6 + (–2)) + 2 • (–8) • 42 = ________ A.1024 B.768 C.–256 D.–252

inna [77]

It should be -668 maybe answer B is a typo

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2 years ago

1st Step: 3 - 4x - 7 = -24 2nd Step: 3- 7 - 4x = -24 What property justifies the 2nd step

gizmo_the_mogwai [7]

Answer:

the subtraction

Step-by-step explanation:

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2 years ago

Ethan's taxable income is $87,525. Use this tax schedule to calculate the total amount he owes in taxes.

V125BC [204]

Answer: $18,617.75 is the answer

$87,525-$77,100=$10,425 (the amount over $77,100)

$10,425 x .28=$2,919 (the 28% taxed amount over $77,100)

$2,919+$15,698.75 (the already taxed amount in the chart)=$18,617.75

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers

A music buff wants to estimate the percentage of students at a midwestern university who believe that elvis is still alive. how

gulaghasi [49]

Since we are not given any information about the proportion, we will assume the sample proportion to be 0.50

so,
p = 0.50
The Error is 10% percentage point. This means that on either side of the population proportion the error is 5% so E = 0.05
z = 1.645 (Z value for 90% confidence interval)

The margin of error for population proportion is calculated as:

$E=z* \sqrt{ \frac{p(1-p)}{n} } \\ \\ 
 \frac{E}{z} = \sqrt{ \frac{p(1-p)}{n} } \\ \\ 
( \frac{E}{z} )^{2}= \frac{p(1-p)}{n} \\ \\ 
n= p(1-p)* (\frac{z}{E})^{2} \\ \\ 
n=271$

This means 271 students should be included in the sample

5 0

2 years ago