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borishaifa [10]
3 years ago
15

Simplify the following expression. (3x + 4)(x − 7)

Mathematics
2 answers:
ololo11 [35]3 years ago
8 0
4x-3

You really just merge all the variables together.

Like 3x and X (3x+1) together make 4x
And, 4-7=-3
Vlad1618 [11]3 years ago
3 0
<h2>Answer:</h2>

3 x^{2}-17 x-28

<h2>Given: </h2>

(3 x+4)(x-7)

<h2>Step-by-step explanation:</h2>

The given problem is in algebra, this is because it has both variable and constant.

From question, we need to find the simplified form of the given expression. The simplified form denotes the form which is more understandable form.

Now, we need to multiply the brackets,

\Rightarrow 3 x^{2}-21 x+4 x-28

On solving,

\therefore 3 x^{2}-17 x-28

Which cannot be solved further.

This expression has ‘x’ to the power 2 which will form second order equation when equated to zero.

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Please help I don’t know this question .
serg [7]

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6 0
3 years ago
Q10 A student wants to raise £100 for charity.
ElenaW [278]

Answer:

He must charge minimum £0.84 for one hot dog.

Step-by-step explanation:

Ingredients cost for hot dogs at the supermarket,

Price of dog sausages tin of 8 = 50p ≈ £0.5

Price of dog bun packs of 6 = 90p ≈ £0.90

Number of tins required for 150 hot dogs = \frac{150}{8} = 6.25

So student will purchase 7 tins.

Cost of 7 tins = 7 × 0.5

                      = £3.5

Number of dog buns packets required = \frac{150}{6} = 25

Cost of 25 packs = 25 × 0.9

                            = £22.5

Total cost of the material used for 150 buns = 22.5 + 3.5

                                                                         = £26.0

Let the selling price of each hot dog = £x

Then selling price of 150 hot dogs = £150x

Students wants the profit = £100

So, Selling price - Cost price = profit

150x - 26 = 100

150x = 126

x = \frac{126}{150}

x = £0.84

Therefore, he must charge minimum £0.84 for one hot dog.

8 0
3 years ago
Solve it by substitution method:- 5x - 6y=-9 and 3x + 4y= 25
user100 [1]
\left\{\begin{array}{ccc}-5x-6y=-9&/\cdot2\\3x+4y=25&/\cdot3\end{array}\right\\+\left\{\begin{array}{ccc}-10x-12y=-18\\9x+12y=75\end{array}\right\\------------\\.\ \ \ \ \ \ \ -x=57\\.\ \ \ \ \ \ \ \ \ x=-57\\\\3\cdot(-57)+4y=25\\-171+4y=25\\4y=25+171\\4y=196\ \ \ \ /:4\\y=49\\\\Solution:x=-57;\ y=49.
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3 years ago
If you have 24 classmates, how many ways are there for you to choose 4 team mates?
valkas [14]
You can try 4 x 6 = 24 so you can have 4 team mates of 6 groups ? is that what your asking
3 0
3 years ago
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