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3 years ago

Solve the system of equations.

Mathematics

1 answer:

slavikrds [6]3 years ago

8 0

A..... (im pretty sure)

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Another way to write (6+7)x

Blizzard [7]

Answer:

13x

Step-by-step explanation:

you just have to add the six and the seven together and then add the x

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2 years ago

Read 2 more answers

Help please within the next hour

olasank [31]

c. 9

To complete the square, you take half of the coefficient of b and square it. It's important to note that the value being added will always be positive.

${ax}^{2} + bx + c$

$b = - 6$

$- 6 \div 2 = - 3$

$= {( - 3)}^{2}$

$= 9$

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3 years ago

How do I solve problem 15

Alex

233.3333333. and you cant sell .333 of a book so 234 books

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2 years ago

Write an equation with the point (3,7) and has a slope of 7

raketka [301]

Answer:

slope = 7 and point = (3, 7)

b = y - slope*x

b = 7 -7 * 3

b = -14

Then we enter "b" and the slope into this equation:

y = 7x -14

Step-by-step explanation:

8 0

3 years ago

Two solutions of differently concentrations of acid are mixed creating 40 mL of a soul union that is 32% acid one-quarter of the

AleksAgata [21]

Answer: Three quarters (30 ml) is made up of a 36% acid solution.

Step-by-step explanation:

Since we have given that

Total amount of solution = 40 ml

One- quarter of the solution is given by

$\frac{1}{4}\times 40\ ml\\\\=10\ ml$

Three-quarter of the solution is given by

$\frac{3}{4}\times 40\\\\=30\ ml$

According to question, we have

10 ml of solution is made up of = 20% of acid solution

30 ml of solution is made up of = say<em> 'c </em>' of acid solution

40 ml of solution is made up of = 32 % of acid solution

So, our equation becomes,

$10\times 0.2+30\times c=40\times 0.32\\\\2+30c=12.8\\\\30c=12.8-2\\\\30c=10.8\\\\c=\frac{10.8}{30}\\\\c=0.36\\\\c=36\%$

Hence, three quarters (30 ml) is made up of a 36% acid solution.

5 0

3 years ago