![ramandeep](/avatars/14025.jpg)
ramandeep
02.08.2019 •
Mathematics
1. if the length of a rectangle is decreased by 4 cm and the width is increased by 5 cm, the result will be a square, the area of which will be 40 cm2 greater than the area of the rectangle. find the area of the rectangle. 2.the perimeter of a rectangle is 30 cm. if its length is decreased by 3 cm and its width is increased by 5 cm, the area of the rectangle will decrease by 8 cm2. find the area of the original rectangle.
Solved
Show answers
More tips
- G Goods and services How to Choose a Bread Maker?...
- A Art and Culture Who Said The Less We Love a Woman, the More She Likes Us ?...
- F Family and Home How to Get Rid of Your Neighbors?...
- S Society and Politics How Could Nobody Know About the Dead Mountaineers?...
- H Health and Medicine How to Cure Adenoids?...
- H Health and Medicine Why Wearing a Back Brace Can Be Beneficial During Back Strain?...
- S Sport When and Where Will the 2014 World Cup be Held?...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
Answers on questions: Mathematics
- M Mathematics This question hard solve fast lots of points...
- M Mathematics Will give brainliest place an x by the correct statement of the rule; then complete the table for missing values. part 1- a merchant adds $3.00 to his cost to determine...
- C Chemistry If 260 ml of o2 gas is collected at 21 degrees celsius and 101.3 kpa, what volume would this gas occupy at stp?...
- E Engineering A cylindrical specimen of aluminum of 19 mm diameter, 200 mm length, 69 GPa elastic modulus, and 0.33 Poisson s ratio is deformed elastically in tension by a force of 48.8...
- M Mathematics Joan found the area of the trapezoid below by creating triangles as shown. What is the total area of the trapezoid? 6 units 8 units 12 units 24 square units 48 square units...
- M Mathematics On a six-sided dice, each has a number between 1 and 6. What is the probability of throwing a 3 or a 5 ....
- M Mathematics 3x^2 + 90 = 360 work out the value of x...
Ответ:
(L-4)=(W+5)
(L-4)(W+5)=LW+40
simplify the first equation: L-W=5
simplify the second equation: (L-4)(W+5)=LW+40
LW-4W+5L-20=LW+40 =>5L-4W=60
solve this system of equations: L-W=9
5L-4W=60
you get W=15, L=24, so the area is 24*15=360
#3:
(L-3)(W+5)=LW-8
2L=2W=30
W=68/8=8.5, L=52/8=6.5, LW=55.25
Ответ: