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4 years ago

1) ( r - 6 ) ( r + 9 ) Simplify this expression ! Please answer this !!

Mathematics

2 answers:

lakkis [162]4 years ago

8 0

r2 + 3r - 54 is correct (MathPapa)

Igoryamba4 years ago

6 0

Answer:

(r-6) (r + 9) = r^2 + 3r - 54

Hopefully this helps.

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How many different committees of 4 people can be chosen from a group of 21?

sdas [7]

Answer:

There are 21 ways to choose the first person, 20 ways to choose the second, 19 ways for the third and 18 ways for the fourth so the answer is 21 * 20 * 19 * 18 = 143640.

4 0

3 years ago

PLEASE HELP 100 POINTS I NEED ASAP MATH LEVEL 8TH GRADE

Tom [10]

The rate of change of the plane's altitude is 2250 feet per minute.

<h3>How to calculate the rate?</h3>

The rate of change of the plane's altitude will be:

= (35000 - 17000)/8

= 18000/8

= 2250 feet per minute.

When graphing the descent of the plane, the starting value for its altitude be 35000 feet.

The linear function will be:

y = mx + b

35000 = 2250x + b

35000 = 2250(0) + b

b = 35000

y = -2250x + 35000

The information given in this problem that did not need to write an equation for the descent is the initial details about how long that the plane travelled.

Learn more about rates on:

brainly.com/question/16145682

#SPJ1

4 0

2 years ago

The bulk grain carrier carries 10,000 tonnes of wheat. Each grain pump delivers 0.5 of a tonne per minute and there are 10 such

Masteriza [31]

It will take 15 minutes to fill the ship to 75% of its capacity

5 0

4 years ago

Find the common ratio for the following sequence. Type a numerical answer in the space provided. If necessary, use the

VashaNatasha [74]

Answer:

-1

Step-by-step explanation:

the common ratio in this geometric series is -1

6 0

4 years ago

A certain office supply store stocks 2 sizes of self-stick notepads, each in 4 colors: blue, green, yellow, or pink. The store p

liq [111]

Answer: (C) 16

Step-by-step explanation:

Given : Number of sizes of self-stick notepads= 2

Number of colors = 4

Type 1 : The store packs the notepads in packages that contain 3 notepads of the same size.

i.e. By Fundamental principle of counting , we have

Number of different packages possible = Number of colors x No. of sizes

= $4\times2=8$

Type 2: Notepads of the same size and of 3 different colors.

Choices for 3 different colors out of 4 : $^4C_3=\dfrac{4!}{3!(4-3)!}=4$

Again by fundamental principle :

Number of different packages possible = No. of choices for choosing 3 different colors x No. of sizes

= $4\times2=8$

From Type 1 and Type 2 , the total number of different packages of the types described above are possible =8+8= 16

Hence, the correct answer is option (c) 16.

4 0

4 years ago