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4 years ago

Please help me with this, will mark brainliest and give 80 points to the person who helps with all questions.

Mathematics

2 answers:

Vsevolod [243]4 years ago

6 0

Answer:

Perimeter = 10x+8 cm

If x=4 P = 48cm

Area = 6x^2 +5x-21 cm^2

If x=4 A = 95 cm^2

Perimeter of new blanket is =10x+18 cm

Step-by-step explanation:

Perimeter = 2(l+w)

= 2( 3x+7 + 2x-3)

Combine terms

= 2(5x+4)

Distribute

= 10x+8 cm

Let x = 4

P = 10*4 +8

= 40+8

=48 cm

A = l*w

= (3x+7) (2x-3)

FOIL

first: 3x*2x =6x^2

outer: 3x*(-3) = -9x

inner: 7*2x = 14x

last = 7*-3 = -21

Add together = 6x^2 -9x+14x -21

=6x^2 +5x-21 cm^2

If x=4

A = 6 (4)^2 +5(4) -21

=6*16 +20-21

=96+20-21

= 95 cm^2

New blanket with length 5 cm longer

Perimeter = 2(l+w)

l = 3x+7+5

l = 3x+12

= 2( 3x+12 + 2x-3)

Combine like terms

=2(5x+9)

Distribute

=10x+18 cm

ivann1987 [24]4 years ago

4 0

Answer:

New blanket with length 5 cm longer

Perimeter = 2(l+w)

l = 3x+7+5

l = 3x+12

= 2( 3x+12 + 2x-3)

Combine like terms

=2(5x+9)

Distribute

=10x+18 cm

Step-by-step explanation:

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