3 years ago

The sum of two numbers is 100. Their difference is 30. Find the larger number.

Mathematics

1 answer:

Kisachek [45]3 years ago

3 0

Answer:

Step-by-step explanation:

I suppose its 70 because... 7 + 3 = 10

and 70 + 30 = 100...so the SUM is 100...yet minus 30 would be 70...so

70 is the bigger number...

please let me know if this was right...

hope I helped!

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What is the sum of /-10/ and /6/

kap26 [50]

Answer:

Step-by-step explanation:

-10 opposite is 10 which this \ or | means the its positive number. So 10 +6 is 16

7 0

3 years ago

A ladder that is 13 meters long is leaning against a wall. The distance between the foot of the ladder and the wall is 7 meters

Maksim231197 [3]

<h2>Answer:</h2>

The equation that is used to model the length of ladder in terms of x is:

$x^2-7x-60=0$

<h2>Step-by-step explanation:</h2>

We can model this problem with the help of a right angled triangle whose hypotenuse is 13 meters and the other two legs are x meters and (x-7) meters.

where x is the distance between the top of the ladder and the ground.

and (x-7) is the distance between the foot of the ladder and the wall.

Hence, using Pythagorean Theorem we have:

$13^2=x^2+(x-7)^2\\\\i.e.\\\\169=x^2+x^2+49-14x\\\\i.e.\\\\169=2x^2-14x+49\\\\i.e.\\\\2x^2-14x+49-169=0\\\\i.e.\\\\2x^2-14x-120=0\\\\i.e.\\\\x^2-7x-60=0$