A rectangle has a area of 45 square units.The length is 4 units less than the width.What are the dimensions of the rectangle

Answers

Answer 1

Answer: A = lw

A= 45 unit²

l= w-4

45= (w-4)w

45=w²-4w

w²-4w-45=0

(w-9)(w+5)=0

w=9, -5 so 9 is the width

l=9-4 =5 is the length

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CANT GET WRONG PLZ HELPSimplify 1 + {2x - 3(1.8 divided by 0.2)} a. 2x - 26 b. 2x + 28 c. 3x - 27 d. -7x + 1
Matilda is filling a circular section of her porch with colorful pebbles. She knows the diameter of the circular section is 15ft, and each bag of pebbles covers 10ft. How many bags of pebbles will Matilda need? A. 15 bags B. 16 bags C. 17 bags D. 18 bags

1.75 = 12.3 - x / 2.8

Solve for x

Answers

1.75=12.3-x/2.8
x=(12.3-1.75)2.8
x=29.54

1.75 = 12.3 - x / 2.81.75-12.3=-x/2.8

-10.55=-x/2.8

-10,55*-2.8=x

x=29.54

To my knowledge, the answer should be there is no difference since I found the sum, however the answer is something else, could someone please explain

Answers

In the first series, the summation applies to the whole (2n+3) inside
the parentheses, so the 3 gets summed up 5 times.

But in the second one, the summation only applies to the 2n , so
the 3 is only added after the summation is finished.

The difference between five 3s the first time and one 3 the second time
is your 12 .

The difference between them is 12 because :
the sum of first series is : 2 * ( 1 + 2 + 3 + 4 + 5 ) + 15;
the sum of the second series is : 2 * ( 1 + 2 + 3 + 4 + 5 ) + 3.

Roxanne has $20 and she wants to buy some shirts. She picks one shirt that costs $10.99 and two shirts that cost $4.99 each. Which statement best describes if an exact total or an approximate total should be calculated? A. Roxanne must add the exact cost of the three shirts so she will know if she has enough money to buy the third shirt. B. Roxanne can round the prices of the shirts to the nearest dollar and then add to estimate if she has enough money.

Answers

your answer is B hope it right

Use the quadratic formula to solve x^2 + 9x + 10 = 0. Estimate irrational solutions to the nearest tenth. A {–3.6, 16.4}
B {–7.7, –1.3}
C {–25, 16}
D {–15.4, –2.6}

Answers

Basically, just plus your numbers into quadratic formula. A= 1, B= 9, C= 10.
The answer you will get is B.

$x^(2) + 9x + 10 = 0 \nx = \frac{-(9) +/- \sqrt{(9)^(2) - 4(1)(10)}}{2(1)} \nx = (-9 +/- √(81 - 40))/(2) \nx = (-9 +/- √(41))/(2) \nx = (-9 +/- 6.4)/(2) \nx = (-9 + 6.4)/(2) \nx = (-2.6)/(2) \nx = -1.3 \n \nx = (-9 - 6.4)/(2) \nx = (-15.4)/(2) \nx = -7.7$

It is equal to B.

Lee needed to make drapes the length from the floor to the top of the window. The wall beneath the window had the height of 2 2/3 feet and the height of just the window measured 2 3/4 feet. How long do the drapes have to be?

Answers

$We\ should\ sum \ those \ two\ measurements\ to \ obtain\ length\ of\ drapes\n\n 2 (2)/(3)+2(3)/(4)=(8)/(3)+(11)/(4)=(24)/(12)+(33)/(12)=(57)/(12) =4,75feet$

Suppose a population of 250 crickets doubles in size every 6 months. How many crickets will there be after 2 years?A. 1,000 crickets

B. 2,000 crickets

C. 4,000 crickets

D. 6,000 crickets

Answers

the answer would be C. 4,000

the answer is C because 250*2=500 than 500*2=1000 than 1000*2=2000 than 2000*2=4000

hope i helped

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