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Advocard [28]
3 years ago
12

I need help with this equation. 9q - 14 + 3(q - 8) = 7 I looked it up and the answer was 3.75, however I don't understand how it

works.
Mathematics
1 answer:
coldgirl [10]3 years ago
8 0
Parentheses first

9q-14+3q-3(8)=7
9q-14+3q-24=7

Combine like terms

9q + 3q - 14 - 24 = 7
12q -38=7

add 38 to both sides

12q - 38 + 38 = 7 + 38

12q = 45

divide both sides by 12

q = 45/12
q = 3.75


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I am not sure how sigma notation works, can somebody explain how to solve this? It isn't the second choice.
Masja [62]

Answer:

first answer is correct

Step-by-step explanation:

Hello, we want to write 2 + 4 + 6 + ... + 20

for n = 1, 2n = 2*1 =2

for n = 2, 2n = 2*2=4

for n = 3, 2n=2*3=6

etc

so

\displaystyle \sum_{n=1}^{10} {2n} = 2*1 + 2*2 +2*3+2*4+...+2*10=2+4+6+8+...+20

thanks

6 0
3 years ago
Which of the following pairs of units of measurement are equivalent to each other?
evablogger [386]

Answer:

The correct options are:

  • cubic decimeter and liter  
  • cubic centimeter and milliliter

Step-by-step explanation:

1) The 1 cubic decimeter is equal to the 1 liter.

dm^3= 1 L

2) The 1 cubic centimeter is equal to the 1 milliliter.

cm^3=1 mL

3) Since,1 cubic decimeter is equal to the 1 liter.

So,dm\neq 1L

4) Since, 1 quart = 0.946353 L

quart\neq liter

5) Since,The 1 cubic centimeter is equal to the 1 milliliter.

So, 1 millimeter ≠ 1 deciliter  

6) Since,1 gram = 0.035274 ounces

So, 1 gram ≠ 1ounce

3 0
3 years ago
Bryans gocket team is purchasing jersys. The company charges $250 for the onetime set-up fee and $23 for each printed jersey whi
ioda

Given:

The company charges $250 for the onetime set-up fee and $23 for each printed jersey.

To find:

The expression that represents the total cost of x number for the team.

Solution:

We have,

Fixed charges = $250

Additional charges = $23 per printed jersey

Let x be the number of printed jersey. Then,

Additional charges = $23x

Total chargers = Fixed charges + Additional charges

                        = $(250 + 23x)

Therefore, the expression for the total charges is $(250 + 23x).

4 0
3 years ago
Justin got a gift card to Cold Stone Creamery. Every time he goes, he gets an ice cream sundae, and it costs $6.75. If he bought
kicyunya [14]

Answer:

27

Step-by-step explanation:

27, because 6.75*4=27

4 0
3 years ago
PLEASE HELP (50 POINTS)
faltersainse [42]

1.F

2.T

3.T

4.T

good luck

7 0
3 years ago
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