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2 years ago

What’s the product (6r-1)(-8r-3)

Mathematics

2 answers:

Minchanka [31]2 years ago

7 0

Answer: A

Step-by-step explanation:

Elena-2011 [213]2 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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franklin school has 3 boys for every 4 girls in the fifth grade. there are 140 students in the 5th grade. How many boys are ther

marin [14]

Answer:

There are 60 boys and 80 girls in Franklin School.

Step-by-step explanation:

"franklin school has 3 boys for every 4 girls in the fifth grade." means that the ratio of boys to girls is: 3:4

It can also be written as 3/4

Also given

Total number of students: 140

We will use ratios to find the number of boys and girls in shool.

First of all, we have to calculate the sum of ratio which is: 3+4 = 7

Let b be the number of boys and g be the number of girls

Then

$b = \frac{Ratio\ of\ boys}{Sum\ of\ ratio} * Total\ students\\= \frac{3}{7} * 140\\= 3*20\\=60\\g = \frac{Ratio\ of\ girls}{Sum\ of\ ratio} * Total\ students\\g = \frac{4}{7}*140\\= 4*20\\=80$

Hence,

There are 60 boys and 80 girls in Franklin School.

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2 years ago

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1 year ago

Simplify the expression. write the answer using scientific notation 4(6.2x10^11)

Veseljchak [2.6K]

Answer:
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7 0

2 years ago

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In a right triangle the leg opposite to the acute angle of 30 degrees in 7in. Find the hypotenuse and the other leg

Kay [80]

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2 years ago

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Evaluate the expression w 2 - v + 1 for w = -2 and v = -8. A. 5 B. 13 C. -11 D. -3

11Alexandr11 [23.1K]

W² - v + 1

(-2)² - (-8) + 1

4 + 8 + 1 = 13

B.13 is your answer

(two negatives = one positive)*
(plug in -2 for w, and -8 for v)
(is that w², or do you mean 2w?)

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3 years ago

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