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3 years ago

Simplify the expressions by combining like terms 4r + 9r - 11r + 7r

Mathematics

2 answers:

nataly862011 [7]3 years ago

7 0

Answer:

4r+9r+7r-11r

=20r-11r

=9r

konstantin123 [22]3 years ago

4 0

9r
Explanation:
4r + 9r = 13r
13r-11r = 2r
2r + 7r = 9r

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Petra was given 12 yards of fabric to make costumes for the school play if each costume requires 1 1/2 yards how many costumes c

solmaris [256]

Petra can make 8 costumes with 12 yards of fabric

<h3><u>Solution:</u></h3>

Given that Petra was given 12 yards of fabric to make costumes for the school play

Each costume requires $1\frac{1}{2}$ yards

<em><u>To find: number of costume Petra can make</u></em>

The number of costume Petra can make is calculated by dividing the total fabric she has by fabric needed for one costume

$\text {number of costume Petra can make }=\frac{\text {total fabric she has }}{\text {fabric needed for one costume }}$

Total fabric she has = 12 yards

Fabric needed for 1 costume = $1\frac{1}{2} = \frac{2 \times 1 + 1}{2} = \frac{3}{2}$ yards

Therefore,

$\text {number of costume Petra can make }=\frac{12}{3 / 2}=\frac{12}{3} \times 2=8$

Thus petra can make 8 costumes with 12 yards of fabric

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3 years ago

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elena55 [62]

Answer:

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Answer:

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Step-by-step explanation:

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3 years ago