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3 years ago

What’s the product (6r-1)(-8r-3)

Mathematics

2 answers:

Minchanka [31]3 years ago

7 0

Answer: A

Step-by-step explanation:

Elena-2011 [213]3 years ago

4 0

$\text{Use FOIL method}\ (a+b)(c+d)=ac+ad+bc+bd.\\\\(6r-1)(-8r-3)=(6r)(-8r)+(6r)(-3)+(-1)(-8r)+(-1)(-3)\\\\=-48r^2-18r+8r+3=\boxed{-48r^2-10r+3}$

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3) John has decided to invest his $20,000 in two saving accounts. He decides to invest some of it at 4.5% annual interest and th

Elza [17]

The amount he invested in the account that yields 4.5% interest is $7,500.

The amount he invested in the account that yields 2.5% interest is $12,500.

<h3>What is the system of equations that represent the question?</h3>

a + b = $20,000 equation 1

0.045a + 0.025b = $750 equation 2

Where:

a = amount he invested in the account that yields 4.5% interest

b = amount he invested in the account that yields 2.5% interest

<h3>How much was invested in the account that yields 4.5% interest?</h3>

Multiply equation 1 by 0.025

0.025a + 0.025b = 500 equation 3

Subtract equation 3 from 2

250 = 0.02a

a = 12,500

<h3>How much was invested in the account that yields 4.5% interest?</h3>

Subtract 12,500 from 20,000

20,000 - 12,500 = $7,500

To learn more about simultaneous equations, please check: brainly.com/question/25875552

7 0

2 years ago

Please help me I’ve asked this questions several times and I really need help with this I do not understand it at all

Ulleksa [173]

Answer:

(-5,-2)

(-4,-3)

(-6,-1)

Step-by-step explanation:

-5(x)-2(y)=-7

-4(x)-3(y)=-7

-6(x)-1(y)=-7

6 0

2 years ago

Find the value of the power.<br> 7-⁴<br>The value of the power is ( )

Svetradugi [14.3K]

Answer:

1/2401

Step-by-step explanation:

$7^{-4}=\dfrac{1}{7^4}=\boxed{\dfrac{1}{2401}}$

8 0

3 years ago

MatroZZZ [7]

Answer:

...; 0; 22

Step-by-step explanation:

The pattern appears to consist of two interleaved arithmetic sequences.

Odd-numbered terms increase by 5: 2, 7, 12, 17, 22.

Even-numbered terms decrease by 6: 18, 12, 6, 0.

The next two terms are 0 and 22.

8 0

2 years ago

PLEASEE HELPPPP IVE BEEN WAITING FOR HOURS!!!!!

kozerog [31]

Answer:

The perimeter is $32\sqrt{7}$ cm.

Step-by-step explanation:

Perimeter is found by adding all sides of the triangle together. So, this is what we need to find: $8\sqrt{7}+4\sqrt{63}+6\sqrt{28}$

Only <u>like radicals</u> can be added or subtracted from one another. They'll have the same root number (which seems to be true for this question) as well as the radicand, which is the number/expression under the radical.

Look at the number under the radical: 7, 63, and 28. These numbers all share a factor of 7: 7/7 = 1, 63/7 = 9, 28/7 = 4.

Notice how 9 and 4 are perfect squares, so we can simplify the radicals using this common factor of 7.

$8\sqrt{7}$ remains the same; $4\sqrt{63}=4\sqrt{9(7)} =4(3)\sqrt{7}=12\sqrt{7}$ ; and

$6\sqrt{28}=6\sqrt{4(7)}=6(2)\sqrt{7}=12\sqrt{7}$ . Now they are like radicals and can be added!

$8\sqrt{7}+12\sqrt{7}+12\sqrt{7}=32\sqrt{7}$

3 0

2 years ago