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3 years ago

7 copies of the sum of 8 and 4

Mathematics

1 answer:

tiny-mole [99]3 years ago

3 0

The answer is 84 because 8+4=12 12x7=84

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If 3a-2b= 8 and a+3b=7 what is the value of 4a+b?

Fittoniya [83]

Step 1: Find the value of one variable in terms of the other.

$a+3b=7\\a=7-3b$

Step 2: Substitute the value you just found for this variable in the other equation.

$3a-2b=8\\3(7-3b)-2b=8\\21-9b-2b=8\\21-11b=8\\21=8+11b\\13=11b\\\frac{13}{11}=b\\ b=1\frac{2}{11}$

Step 3: Use your new value for the second variable to find the first.

$a+3b=7\\a+3(1\frac{2}{11})=7\\a+3\frac{6}{11}=7\\\\a=3\frac{5}{11}$

Now that we know the values for a and b we can find the value of 4a+b.

$4a+b\\4(3\frac{5}{11})+1\frac{2}{11}\\12+\frac{20}{11}+1\frac{2}{11}\\\\12+1\frac{9}{11}+1\frac{2}{11}\\\\\boxed{15}$

6 0

3 years ago

[79 points if correct] Help me with any 4 questions! Please !!!!

Anarel [89]

Answer:

(BEFORE YOU SUBMIT IT, PLEASE READ THE WARNING)

QUESTION EIGHT: 2690

QUESTION NINE: 120

QUESTION ELEVEN: 12.5

QUESTION FOURTEEN: 24

Step-by-step explanation:

WARNING!! FOR QUESTIONS WITH INTEREST: I do not know if interest is good or bad (if you get money, or if you lose money. I counted interest as making money, but if you are sure it's not, contact me in the comments and I will solve it again! :)

may 3rd -> july 15th = 73 days

500*0.06 = 30

30 = how much he makes in one day (so he has 530 after 1 day)

30*73 = 2190

500 + 2190 = 2690

210/7 = 30

1% for 3 years = 30

1% for 1 year = 10

100% for 1 year = 1000

2000*0.06 = 120

11.

54,000*0.08 = 4320

54,000/4320 = 12.5

14.

5000*6.26% = 312.5

7500/312.5 = 24

5 0

3 years ago

Stephanie is looking into season passes at magic mountain. The basic membership costs $12 monthly and $6 per each visit . The ep

Sphinxa [80]

Answer:

Step-by-step explanation:

so its at 12 visits because its their lowest common factor so i think it should be 12

4 0

3 years ago

1. Alexia started babysitting when she was in high school. She has built a reputation for herself and has become popular among t

Alinara [238K]

$10+$5=15
$75/$15=5
Hours = 5

Is this what you were looking for?

7 0

3 years ago

In a recent game butler school basketball team took 20 three point shots they made 35% of the shots they took how many three-poi

BaLLatris [955]

All you simply have to do is multiply 20 x 0.35. Multiplying it by 0.35 will turn it into the number that makes up 35%. The answer would be they made 7 shots.

4 0

3 years ago