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tangare [24]
2 years ago
13

Simplify 5(a+7)+2(a+4)​

Mathematics
2 answers:
Zina [86]2 years ago
8 0

Answer:

7a+43

Step-by-step explanation:

harina [27]2 years ago
4 0
First, we have to distribute 5(a+7) using the distributive property. We get 5a and 35. Then, we do the same with 2(a+4), getting 2a and 8. Lastly, we add both results. 5a + 2a and 8 + 35 = 7a + 43
Therefore, the answer would be 7a +73.
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Mr. Wilson invested money in two accounts. His total investment was $20,000. If one account pays 5% in interest and the other pa
blagie [28]

a = amount invested at 5%

b = amount invested at 2%

now, we know the total invested by Mr Wilson was 20000, so whatever "a" and "b" might be, we know that a + b = 20000.

a + b = 20000\implies b = 20000-a \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{5\% of a}}{\left( \cfrac{5}{100} \right)a}\implies 0.05a~\hfill \stackrel{\textit{2\% of b}}{\left( \cfrac{2}{100} \right)a}\implies \begin{array}{llll} 0.02b\\\\ \stackrel{substituting}{0.02(20000-a)} \end{array}

now, we know the total of earned interest is 550 bucks, so then

0.05a~~ + ~~0.02(20000-a)~~ = ~~550\implies 0.05a+400-0.02a=550 \\\\\\ 0.03a+400=550\implies 0.03a=150\implies a=\cfrac{150}{0.03}\implies a=5000 \\\\\\ ~\hspace{24em}\stackrel{20000~~ - ~~5000}{b=15000}

5 0
1 year ago
The minimum mark to obtain a Grade A is 75. Cheryn managed to achieve an average of Grade A for three of her English quizzes. Wh
Masteriza [31]

9514 1404 393

Answer:

  60

Step-by-step explanation:

Let m represent the mark Cheryn scored on her first quiz. Then her average is ...

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  m +165 ≥ 225 . . . . . . . . multiply by 3

  m ≥ 60 . . . . . . . . . . . . subtract 165

Cheryn scored a minimum of 60 marks on her first quiz.

4 0
2 years ago
the probability that a couple will have two children, so that their first child is a boy and their second child is a girl is 1/2
a_sh-v [17]

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7 0
3 years ago
Read 2 more answers
Help me with this question please, explain why u choose that answer and show ur steps
Setler [38]
Let’s condense the original expression and see if that’s one of the answers

-1/2(-3/2 x + 6x + 1) - 3x

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Combine like terms

(3/4 x - 3x - 3x) -1/2

-21/4 x - 1/2

We could make this a mixed number

-5 1/4 x - 1/2

(Mixed number: 5 times 4 plus one gets the numerator)

So the answer is D
7 0
3 years ago
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Which expression is equivalent to log3 c/9?
stepladder [879]
Hello!

There is an existing logarithmic property that states that log \frac{M}{N} is equal to log M-logN.

Following that property, we can tell that log \frac{c}{9} would be equal to log(c)-log(9).

ANSWER: log(c)-log(9) (third option)
5 0
3 years ago
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