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Dennis_Churaev [7]
2 years ago
10

50 points

Mathematics
2 answers:
spayn [35]2 years ago
6 0

Answer:

see below

Step-by-step explanation:

whenever there is negative number being squared, you need to add the brackets so that you inside the - 1 in front of the number

so this step is wrong

\sqrt{ - 9 { }^{2} - 4(1)(20) }

the -9 ² , you must include the brackets to include the -1 in front of the 9

so it should be

\sqrt{( - 9) {}^{2}  - 4(1)(20) }

so you will get = 1

and then you continue with other parts of the formula and you will get real solutions

hope this helps

please mark it brainliest

aliina [53]2 years ago
6 0
Inside the radical should be 81-80 which would be 1 of course and that leaves real solutions. answers are 5 & 4
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Linda and Rob open an online savings account that has a 2.89% annual interest rate, compounded
sp2606 [1]

Answer:

FV= $34,222.33

Step-by-step explanation:

<u>First, we need to calculate the weekly interest rate:</u>

Weekly interest rate= 0.0289/52= 0.00056

<u>To calculate the future value (FV), we need to use the following formula:</u>

FV= {A*[(1+i)^n-1]}/i

A= weekly deposit

n= 15*52= 780

A= $35

FV= {35*[(1.00056^780) - 1]} / 0.00056

FV= $34,222.33

4 0
2 years ago
Use compatible numbers to find two estimates 73÷4,858
zvonat [6]
Compatible numbers to find two estimates 73÷4,858

70÷4,850 = 0.014
You sure it's not 4,858÷73
4,850÷70 =

______ _____ 69 2/7
70)4850. 7)485
42
65
63
8 0
3 years ago
Name the property or definition illustrated below
dimulka [17.4K]

Answer: Substitution

Step-by-step explanation:

GIVEN:

y=3x

2x+4y=12

Then, 2x+4(3x)=12

-----------------------------------------

Substitution: replacing one variable in terms of another variable.

As we can see from the given aspects, y=3x, and the conclusion expression has no y instead of 3x. This means it represented y in terms of x, which fits the definition of substitution that replaces one variable.

Hope this helps!! :)

6 0
2 years ago
What is the answer to<br> (-6x-6)+(8x-6)
Otrada [13]
(-6x-6)+(8x-6)
-6x-6+8x-6
2x-12

Hope this helps :)
8 0
2 years ago
Find the equation of the exponential function represented by the table below:​
aivan3 [116]

Answer:

I believe its y=5(4)^x

Step-by-step explanation:

The equation is supposed to look like y=ab^x

a is basically where it all starts, so where the y meets the 0

- so the 5 in the y's place meets the 0

b is what you're multiplying by on the y's side, which is by 4 every time

and the x is the exponent and since there is no exponent you leave it as x

4 0
3 years ago
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