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Vaselesa [24]
2 years ago
9

What is the value of X? (8y+12) (7x+4)​

Mathematics
1 answer:
GuDViN [60]2 years ago
8 0

Answer:

The value of x is -\frac{4}{7}

Step by step explanation:

In the question we are given a product that contains two unknown variables, i.e. x and y. To solve for x we shall first compute the product between the two brackets. I will show each step in full detail, in order to understand the product computation of such cases (i.e. distributive property).

(8y+12)(7x+4)=0\\\\8y*7x+4*8y+12*7x+12*4=0\\\\56xy+32y+84x+48=0\\\\

Up to this point we have computed the product and now we have all our terms. Since we want to find the value of x we will gather together all terms that contain x (even if they also contain y) and then do some manipulations and simplifications to obtain our result, as follow:

56xy+32y+84x+48=0\\\\56xy+84x=-32y-48\\\\14x(4y+6)=-8(4y+6)

Now we see that on both sides of the equality we have a common term of   (4y+6), which we can cancel out from both sides, which leaves us with:

14x=-8\\\\x=-\frac{8}{14}\\\\ x=-\frac{4}{7}

Thus the value of x is -\frac{4}{7}.

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How many 4-digit numbers are neither multiples of 2 nor multiples of 5?
Gwar [14]

There are 10,000 total four-digit numbers (1000 through 9999).

Multiples of 2 end in 0, 2, 4, 6, and 8. There are 9*10*10*5 = 4500 four-digit multiples of 2.

Multiples of 5 end in 0 or 5. There are 9*10*10*2 = 1800 four-digit multiples of 5.

There is redundancy between the two sets of numbers, namely those that end in 0, which are both multiples of 2 and 5. There are 9*10*10*1 = 900 four-digit multiples of both 2 and 5.

Then there are 4500 + 1800 - 900 = 5400 total four-digit numbers that are either multiples of 2 or 5, which means the remaining 4600 numbers are neither multiples of 2 nor 5.

4 0
3 years ago
A supplier delivers an order for 20 electric toothbrushes to a store. by accident, three of the electric toothbrushes are defect
evablogger [386]
<span>3 of the 20 toothbrushes are defective, so the initial probability of selecting a defective toothbrush on the first try is 3/20. After that, there will be 2 defective toothbrushes in the remaining 19, so the probability of selecting one of those on the 2nd try will be 2/19. To get the probability of those two events happening sequentially, we multiply the two probabilities. Thus (3/20)*(2/19) = 6/380 = 0.0157, or about 1.6%.</span>
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3 years ago
Describe how you could use algebraic operations to solve the equation 1 = -3x + 4
Anna11 [10]

Answer:

x=1

Step-by-step explanation:

3x=4-1

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x=1

3 0
3 years ago
The distance in inches around a toy flying disc with diameter 10 inches is given by the expression pie times 10. Evaluate this e
boyakko [2]

Answer:

pi*10 = 3.14*10 = 31.4 inches

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3 years ago
The quotient of an unknown number and -13 is -14
zysi [14]

Answer:

182

Step-by-step explanation:

Quotient is division

Q/-13 = -14

Multiply each side by -13

Q/-13  * -13 = -14* -13

Q =182

The unknown number is 182

7 0
3 years ago
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