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3 years ago

Lisa is 34 years old.two years ago she was twice as old as her brother.How old is her brother now?

2 answers:

7 0

Hello there, and thank you for posting your question here on brainly.

Lisa is 34 years old, two years ago, she was twice as old as her brother. How old is her brother now?

Answer in short: 18

Why?

Since it was 2 years ago, you subtract 34 by 2 to get 32. Then, since she is twice as old as her brother, we divide 32 by 2, that answer is 16. That is her brother's age when it was two years ago when she was 32. We have to add back the two years to find out how old he is today. 16 + 2 is 18. He is 18 today.

Hope this helped! ☺♥

faltersainse [42]3 years ago

6 0

Her brother would have been 16, which is half of 32 and now he would be 18 years old

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Factor the expression 9x^2 - 30x + 25 I need help

MrMuchimi

Answer:

(3x - 5)²

Step-by-step explanation:

When we expand (3x - 5)², we get:

(3x - 5) (3x - 5)

When we multiply, we get:

9x² - 30x + 25

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Have a great summer :)

7 0

2 years ago

Helpppp plssssss I need to get my grade up in math

KatRina [158]

Answer: 1.25 square feet

This converts to the improper fraction 5/4

===========================================================

Explanation:

The area of the triangle on the left is base*height/2 = 0.5*2/2 = 0.5 square feet. Note that 1/2 = 0.5

The area of the triangle on the right side is base*height/2 = 0.2*3/2 = 0.75 square feet. This converts to the fraction 3/4

Add up the two results: 0.5+0.75 = 1.25 square feet

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If you need the answer as an improper fraction, then,

1.25 = 1 + 0.25

1.25 = 1 + 1/4

1.25 = 4/4 + 1/4

1.25 = (4+1)/4

1.25 = 5/4

3 0

2 years ago

A 9.85 m ladder is placed against a wall. The height to the top of the ladder is 5 m more than the distance between the wall and

Dafna1 [17]

Given:

Length of the ladder = 9.85 m

The height to the top of the ladder is 5 m more than the distance between the wall and the foot of the ladder.

To find:

The height to the top and the distance between the wall and the foot of the ladder.

Solution:

let x be the distance between the wall and the foot of the ladder. Then the height to the top of the ladder is (x+5).

Pythagoras theorem: In a right angle triangle,

$Hypotenuse^2=Base^2+Perpendicular^2$

In the given situation, hypotenuse is the length of ladder, i.e., 9.85 m. The base is x m and the height is (x+5) m.

Using the Pythagoras theorem, we get

$(9.85)^2=x^2+(x+5)^2$

$97.0225=x^2+x^2+10x+25$

$0=2x^2+10x+25-97.0225$

$0=2x^2+10x-72.0225$

Here, $a=2, b=10,c=-72.0225$ . Using the quadratic formula, we get

$x=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}$

$x=\dfrac{-10\pm \sqrt{(10)^2-4(2)(-72.0225)}}{2(2)}$

$x=\dfrac{-10\pm \sqrt{676.18}}{4}$

Approximating the value, we get

$x=\dfrac{-10\pm 26}{4}$

$x=\dfrac{-10+26}{4},\dfrac{-10-26}{4}$

$x=\dfrac{16}{4},\dfrac{-36}{4}$

$x=4,-9$

Distance cannot be negative so $x\neq -9.$

Now we have $x=4$

$x+5=4+5$

$x+5=9$

Therefore, the base is 4 m and the height is 9 m.

5 0

3 years ago

Which expression uses the greatest common factor and the distributive property to rewrite the sum 32 + 80?

vampirchik [111]

16(2+5) since when you use distributive property, 16*2= 32 and 16*5= 80

5 0

3 years ago

What is 3 2/5 x 2 1/3 ?

Hitman42 [59]

3 2/5 x 2 1/3 rewrite

12/5 x 7/3 convert into fractions instead of mixed fraction then multiply straight across

84/15 would be your final answer you might need to reduce it though :) hope i helped

5 0

3 years ago

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