3 years ago

8÷0.5×4+7solve problem

Mathematics

2 answers:

Elodia [21]3 years ago

8 0

I’m pretty sure it’s 71

sleet_krkn [62]3 years ago

4 0

to make it easier for you, format the equation like this:

((8÷0.5)×4)+7 = A

you first Divide 8 by 0.5, you will get 16

Then you multiply 16 by 4, you will get 64

and finnally you add seven, you will get a total of 71

so A = 71

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2 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:

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