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ivann1987 [24]
3 years ago
11

Evaluate the expression for the given value of the variuble with step by step explanation

Mathematics
1 answer:
GaryK [48]3 years ago
7 0

Substitute the value of b = -2 to the expression

-4b-8+(-1)-b^2+2b^3=2b^3-b^2-4b-8-1=2b^3-b^2-4b-9\\\\2(-2)^3-(-2)^2-4(-2)-9=2(-8)-4+8-9=-16-4+8-9=-21

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erik [133]

Answer:

3.456E + 14= 3.456X10^{14

Step-by-step explanation:

The river discharges 4X10^6 cubic feet of water into the Pacific Ocean each second.

There are 86,400 seconds in one day.

Amount of water discharges each day

=4X10^6X86400\\=345600000000\\=3.456X10^{11

Since this differs from what you have, I will explain the scientific notation.

3.456E + 14 simply means 3.456X10^{14

The options are not well laid out but you can pick the appropriate option.

8 0
3 years ago
Explain why the quadratic relation y=2x^2+3x+5 would have no zeros
alex41 [277]

Complete the square to rewrite the quadratic:

2 <em>x</em>² + 3 <em>x</em> + 5 = 2 (<em>x</em>² + 3/2 <em>x</em>) + 5

... = 2 (<em>x</em>² + 3/2 <em>x</em> + 9/16 - 9/16) + 5

... = 2 (<em>x</em>² + 3/2 <em>x</em> + (3/4)²) + 5 - 9/8

... = 2 (<em>x</em> + 3/4)² + 31/8

Any real number squared becomes non-negative, so the quadratic expression has a minimum value of 31/8, which is greater than 0, and so there are no (real) <em>x</em> for which <em>y</em> = 0.

5 0
3 years ago
Amal worked a total of 30 hours last week on Saturday and Sunday he worked 5 times and many hora than he worked the rest of the
aleksley [76]
6 because 30 divided by5 is 6
7 0
4 years ago
Which of the following is the best estimate of 12 18/21?
lions [1.4K]

Answer:

Your simplified fraction would be 12 6/7 so I’d say *C* because that’s the closest to the simplified fraction

Step-by-step explanation:

im  just explain

8 0
3 years ago
Read 2 more answers
HELP ASAP The table shows a proportional relationship between the number of meals and the cans of food used to prepare the meals
TEA [102]

The correct answer to this question is A: 2. Based on this table, you can see that 2 cans of food = 4 meals, and 4 cans of food = 8 meals. This means each can of food can provide 2 meals. I hope this helped!

3 0
3 years ago
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