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3 years ago

Simplify the expression. 2(3y - 7) - 5y(2 - y)

Mathematics

2 answers:

never [62]3 years ago

8 0

Answer: The required simplified form of the given expression is $5y^2-4y-14.$

Step-by-step explanation: We are given to simplify the following expression :

$E=2(3y-7)-5y(2-y).$

To simplify the given expression, we need to evaluate the bracket first.

The simplification is as follows :

$E\\\\=2(3y-7)-5y(2-y)\\\\=6y-14-10y+5y^2\\\\=5y^2-4y-14.$

Thus, the required simplified form of the given expression is $5y^2-4y-14.$

meriva3 years ago

5 0

2(3y - 7) - 5y(2 - y)

2*3y - 2*7 - 5y*2 -5y*(-y)

6y - 14 - 10y + 5y²

5y² + 6y - 10y - 14

5y² -4y - 14

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A red kangaroo hops at an average speed of 20km per hour. How fast is this in meters per minute?

masya89 [10]

Answer:

333.3 meters per minute

Step-by-step explanation:

The best way to solve this problem is using dimensional anaysis. First, we write out our starting units, that being 20km/1hr. We have to keep in mind that we want to change the kilometers to meters and the hours to minutes.

$\frac{20km}{1hr}$

We know that there are 1000 meters in 1 kilometer. We add this to the dimensional analysis as 1000m/1km. We write it as this because we want the kilometers to cancel each other out. We only want the meters.

$= \frac{20km}{1hr} *\frac{1000m}{1km} ...$

We also know that 1 hour is 60 minutes. We add this to the analysis as well so that the hours cancel each other.

$= \frac{20km}{1hr} *\frac{1000m}{1km} * \frac{1hr}{60min}$

We now solve this expression. Since both the kilometers and the hours cancel out, we have meters per minute as our unit. All that's left are the numbers.

= (20*1000*1)/(1*1*60) m/min

= 333.3 meters per minute

8 0

2 years ago

Billy is 5 2/3 feet tall. Maris is 4 11/12 feet tall. How much taller is billy

3241004551 [841]

3/4 feet

You can set this up as an equation and solve

$5\frac{2}{3}-4\frac{11}{12} =5\frac{8}{12} -4\frac{11}{12} =4\frac{20}{12} -4\frac{11}{12}=\frac{9}{12} =\frac{3}{4}$

3 0

2 years ago

A car dealership paid $9,000 for a car. The sticker price is $10,395 for a customer to buy the car. a. What’s the markup in doll

Sladkaya [172]

Answer:

1) To determine how much the change of $9,000 to $10,395, we must subtract 9,000 from 10,395;

10,395 - 9,000 = $1,395 is the change in price (an increase).

Formula to find percentage of change;

Change in price/original amount x 100% (100/100)

Replace those values:

1,935 (change in price/increase) 100

_____ x _____ = %0.215

9,000(original amount) 100

7 0

2 years ago

What is the volume of the square pyramid with base edges 24ft and slant height of 37ft

NemiM [27]

Answer:

6720ft^3

Step-by-step explanation:

37²-12² = a²

1225 = a²

√1225 = a

a = 35

35(24²/3) =

35(576/3) =

35•192 = 6720 cm³

4 0

3 years ago

Read 2 more answers

jose wants to put a fence around his rectangluar garden his garden measure 33 feet by 39 feet. the garden has a path around is 3

Svetlanka [38]

you have to add 2×3 =6 ft to both length and width.
33+6 =39
36 +6=45
the perimeter is
p = 2×39 + 2×45
p = 78 + 90
p = 168

Jose needs 168 ft of fencing

hope it helps.
plz mark me as brainliest

6 0

2 years ago