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Novosadov [1.4K]
3 years ago
5

Stanley makes a $500 investment and then carefully tracks the value as time goes by. At first, the value of Stanley's $500 inves

tment changes by -$4 each day. After how many days, did value of the investment change by -$28?
Mathematics
1 answer:
mafiozo [28]3 years ago
5 0
You would of taken 28 dollars away after 7 days because if your taking away 4$ each day you just have to figure out 4 times what equals 28 witch is 7

So the answer is 7 days
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Find the angle between the vectors u=i-9j and v=8i+5j
Katyanochek1 [597]

Answer: \cos^{-1} \left(\frac{-37}{\sqrt{7298}} \right) \approx 115.665^{\circ}

Step-by-step explanation:

u \cdot v=(1)(8)+(-9)(5)=-37\\\\|u|=\sqrt{1^{2}+(-9)^{2}}=\sqrt{82}\\\\|v|=\sqrt{8^{2}+5^{2}}=\sqrt{89}\\\\\cos \theta=\frac{-37}{\sqrt{82}\sqrt{89}}\\\\\theta=\cos^{-1} \left(\frac{-37}{\sqrt{82}\sqrt{89}} \right)\\\\\theta=\boxed{\cos^{-1} \left(\frac{-37}{\sqrt{7298}} \right) \approx 115.665^{\circ}}

7 0
2 years ago
Simplify 25p^6q^9 / 45p^8q^4. write answer using a positive exponent
sleet_krkn [62]

The simplification of 25p^6q^9 / 45p^8q^4 using a positive exponent;

  • Division is 5p^6 q^9 / 9p^8 q^4
  • Elevated form is  5/9 p^-2 q^5

<h3>What are algebraic expressions?</h3>

Algebraic expressions are expressions made up of factors, variables, terms, coefficients and constants.

They are also comprised of arithmetic operations such as addition, subtraction, multiplication, division, etc

We also know that index forms are also know as standard forms.

They are mathematical expressions showing the power of exponent of a variable in terms of another variable.

Given the index algebraic forms;

25p^6q^9 / 45p^8q^4

Using the rule of indices, we take the negative exponent of the divisor and multiply through.

We have;

5p^6 q^9 × 9p^-8 q^-4

Add exponential values

5/9 p^6-8 q^9 -4

5/9 p^-2 q^5

Thus, the expression is simplified to 5/9 p^-2 q^5

Learn more about index forms here:

brainly.com/question/15361818

#SPJ1

5 0
1 year ago
Here are the points that Noah scored in 7 basketball games last season
icang [17]

Answer:

7

Step-by-step explanation:

its the middle number between the first and last

hope this helps!

8 0
3 years ago
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Yuliya22 [10]

(-2/5)-(-1/8)

Need to make the denominators the same

(-16/40)-(-5/40)

Multiply -2/5 by 8

Multiply -1/8 by 8

-- sign= positive

-16/40+5/40

Answer=-11/40

3 0
3 years ago
I need help The point (1, –5) is reflected across the y-axis.
Paladinen [302]

Answer:

Step-by-step explanation:

Then the x part of the point takes on the opposite sign that it currently has.

  • Right now it is 1. If it takes on the opposite sign, it becomes - 1
  • So the new point is (-1,-5).
  • Nothing happens to the - 5 when reflected across the y axis.

4 0
3 years ago
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