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timama [110]
3 years ago
10

What is the value of the expression below when x=4x=4? 7x^2 +8x-7 7x 2 +8x−7

Mathematics
1 answer:
Vinil7 [7]3 years ago
3 0

Answer: 137

Step-by-step explanation:

The given expression: 7x^2 +8x-7

We need to find the value of the expression when x=4.

So we just use the substitution property and substitute the value of x= 4 in the given expression , we get

7(4)^2+8(4)-7\\\\= 7(16)+32-7\\\\= 112+25\\\\=137

Hence, the value of the expression at x=4 is 137.

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The cost of a pizza is 30 cents less than 8 times the cost of a soda . If x represents the cost of the soda in terms of cents .
Leno4ka [110]

Answer:

c = 8x-30

23x-90

Step-by-step explanation:

Since the cost of soda is x, 8 times the cost of soda is is 8x.

Then, you have to take 30 cents away, so the cost for pizza would be 8x-30 or 8x-.30.

This is your pizza or c.

Next, to put in 3 pizzas and 5 sodas, you just multiply 3 and 5 by the corresponding variables.

So 3(8x-30) + 5(x) = 18x - 90 + 5x = 23x - 90 or 23x - .90

8 0
3 years ago
Given the equation (x-a)^2(x-2)=x^3+bx^2+12x-72 find a and b
ivann1987 [24]
Isolate the variable by dividing each side by factors that don't contain the variable.

a=- \frac{ x^{2}- \sqrt{( x^{3} + x^{2} b+12x-72(x-2)-2x} }{x-2} ,- \frac{ x^{2}+ \sqrt{( x^{3} + x^{2} b+12x-72(x-2)-2x} }{x-2}

Solve for b by simplifying both sides of the equation then isolating the variable.

b= \frac{12}{x}+ \frac{72}{ x^{2} }-2+2a- \frac{4a}{x}+ \frac{ a^{2} }{x}- \frac{2a^{z} }{ x^{2} }

Hopefully i helped ^.^ Mark brainly if possible. Lol once again i saw the same question so why not answer it again!
 


3 0
3 years ago
HELPPPPPP FASTTTTT PLZZZZZZZZZZZZZZZZZZZZ
Varvara68 [4.7K]

Answer:

she did not get at least 2100 and definitely not 85% of the worth

Step-by-step explanation:

3000*0.85=2550

3000*0.7=2100

8 0
3 years ago
Read 2 more answers
Jerry multiplied 3.04 x 7.091 and got the product 2.155664. Is his answer reasonable? Why or why not?
Readme [11.4K]

First we multiply the numbers ignoring the decimal and then place the decimal in the position

3.04 *7.091 = 2155664

Now the first number has two digits after the decimal and the second number has three digits after the decimal.

Therefore in the final result we have to move the decimal (2+3) =5 place from the left,

So the answer would be 21.55664

So, the correct answer is 21.55664

Jerry calculated the answer correctly , but made an error in the placement of the decimal point.  The answer is not reasonable because 2.155664 and 21.55664 mean two completely different answer far apart from each other


6 0
3 years ago
Which expression is equivalent to 5(2+7)?<br> A. 2(5+7)<br> B. 2+7(5)<br> C. 5(2)+7<br> D. 5(2)+5(7)
Kipish [7]
Hope this helps but I this helps but I think the answer is D if not then try B
8 0
3 years ago
Read 2 more answers
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