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3 years ago

Can someone please help me

Mathematics

1 answer:

gtnhenbr [62]3 years ago

8 0

Answer:

1) B) 10

2) B) 9

Step-by-step explanation:

1) 10x+15=115

10x=100

x=10

2) 12x+17=125

12x=108

x=9

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Need help fast plz for my pre calc exam

bezimeni [28]

Answer:

<em>h = 8.54 units</em>

Step-by-step explanation:

<u>The Law of Cosines </u>

It relates the length of the sides of a triangle with one of its internal angles.

Let a,b, and c be the length of the sides of a given triangle, and x the included angle between sides a and b, then the following relation applies:

$c^2=a^2+b^2-2ab\cos x$

Since we know the values of all three side lengths, we solve the equation for x:

$\displaystyle \cos x=\frac{a^2+b^2-c^2}{2ab}$

For the triangle ABC in the image, a=10, b=15, c=13, thus:

$\displaystyle \cos A=\frac{10^2+15^2-13^2}{2*10*15}$

$\displaystyle \cos A=\frac{156}{300}$

$\displaystyle \cos A=0.52$

Thus, A = 58.67°

For the right triangle of height h and hypotenuse 10, we use the sine ratio:

$\displaystyle \sin 58.67^\circ=\frac{h}{10}$

Solving for h:

$h = 10\sin 58.67^\circ$

h = 8.54 units

6 0

3 years ago

Alex bought 4 hoodies. Each hoodie cost the same amount and they were on sale for $5 off each. Alex paid a total of $120. How mu

vladimir2022 [97]

Total price equals 4 hoodies times (original price minus $5).

x= original hoodie price

$120= 4(x-5)
Use distributive property to multiply
120=(4*x) - (4*5)
120= 4x - 20
Add 20 to both sides
140=4x
Divide both sides by 4
$35= x

Original hoodie price was $35.

Hope this helps! :)

8 0

3 years ago

Translate into an inequality.

Alex787 [66]

5x-1 is greater than or equal to -11

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3 years ago

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You and two friends share 7 cookies equally. How many cookies do you each get?

Ivahew [28]

4 cookies because three divided by seven equals three hope I helped

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