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Travka [436]
4 years ago
8

(5x-2)(x+4) find the product

Mathematics
2 answers:
ankoles [38]4 years ago
5 0
5x(x) + (5x)(4) + (-2)(x) + (-2)(4)= 
5x^2 + 20x - 2x - 8=
5x^2 + 18x -8
Elodia [21]4 years ago
3 0
You can combine like terms:

5x times x + -2 add 4

5x^2 + 2
This is the answer after simplifying- hope it helps you?
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On a math test a​ student, Sarah​, has to identify all the coefficients and constants of the expression 9 b + 4 + y. Sarah says
mamaluj [8]

Step-by-step explanation:

4 + n + 7m

constants are just the numbers with no variables (letters)

so the constant is 4

coefficients are numbers multiplied by variables (letters)

so the coefficients are : 7 and 1

the error sarah made is forgetting the coefficient of n......because even if it is not written, n is the same as 1n....so basically, there is a coefficient for EVERY variable, even if its not written.

8 0
3 years ago
Andrew found a pan of brownies with 3/4 of the brownies left. He ate 1/3 of what was left. What portion of the whole brownies di
crimeas [40]

Answer:

1/4

Step-by-step explanation:

Andrew found a pan of brownies with 3/4 of the brownies left. He ate 1/3 of what was left. What portion of the whole brownies did he eat?

The size of the brownies Andre ate =

1/3 of 3/4

= 1/3 × 3/4

= 1/4

Therefore, the portion of the whole brownies that Andre ate was 1/4

3 0
3 years ago
PLEASE HELP!!
erik [133]
2.=c.\\\\2\sin4x\cos4x=2\sin(2\cdot4x)=2\sin8x\\\\Used:\\\sin2\alpha=2\sin\alpha\cos\alpha

1.=b.\\\\\csc x-\sin x=\dfrac{1}{\sin x}-\dfrac{\sin^2x}{\sin x}=\dfrac{1-\sin^2x}{\sin x}=\dfrac{\cos^2x}{\sin x}\\\\=\dfrac{\cos x\cos x}{\sin x}=\cos x\cdot\dfrac{\cos x}{\sin x}=\cos x\cot x\\\\Used:\\\csc x=\dfrac{1}{\sin x}\\\\\sin^2x+\cos^2x=1\to\cos^2x=1-\sin^2x\\\\\cot x=\dfrac{\cos x}{\sin x}

3.=a.\\\\\dfrac{\sin x-1}{\sin x+1}=\dfrac{\sin x-1}{\sin x+1}\cdot\dfrac{\sin x+1}{\sin x+1}=\dfrac{\sin^2x-1^2}{(\sin x+1)^2}=\dfrac{\sin^2x-1}{(\sin x+1)^2}\\\\=\dfrac{-(1-\sin^2x)}{(\sin x+1)^2}=\dfrac{-\cos^2x}{(\sin x+1)^2}\\\\Used:\\(a-b)(a+b)=a^2-b^2\\\\\sin^2x+\cos^2x=1\to \cos^2x=1-\sin^2x
8 0
3 years ago
HELP HELP HELP!!!!! Please help!
viva [34]

Answer:

Regular peanut butter - .23

Family Size Peanut Butter - .15

5 0
3 years ago
Read 2 more answers
you have been given an engine repair job that has a job time of 7 hours how many minutes should you allow for your job?​
Soloha48 [4]

Answer:

Job\ Time = 420\ minutes

Step-by-step explanation:

Given

Job\ Time = 7\ hours

Required

Determine the job time in minutes

To do this, we simply convert the time to minutes.

1\ hour = 60\ minutes

7\ hours = 7 * 60\ minutes

So, we have:

Job\ Time = 7 * 60\ minutes

Job\ Time = 420\ minutes

<em>Hence, the job time in minutes is 420 minutes</em>

3 0
3 years ago
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