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2 years ago

Let x = 6. What is the value of the expression 5x2+x−7 ? Enter your answer in the box.

Mathematics

2 answers:

12345 [234]2 years ago

5 0

This would be 5(6)^2 + 6 - 7

= 180 + 6 - 7 = 179

lutik1710 [3]2 years ago

3 0

5x2+x-7

= 10+6-7
= 16-7
= 9

I hope this is what you're looking for :)

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Simplify. y 5 · y 3 ÷ y 2

Gnesinka [82]

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2 years ago

LK is tangent to circle J at point K. Circle J is shown. Line segment J K is a radius. Line segment K L is a tangent that inters

Evgen [1.6K]

Answer:

$(B)r=\dfrac{85}{12}$

Step-by-step explanation:

Given a circle centre J

Let the radius of the circle =r

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From the diagram attached

LX=6
Radius, XJ=JK=r
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Theorem: The angle between a tangent and a radius is 90 degrees.

By the theorem above, Triangle JLK forms a right triangle with LJ as the hypotenuse.

Using Pythagoras Theorem:

$(6+r)^2=r^2+11^2\\(6+r)(6+r)=r^2+121\\36+6r+6r+r^2=r^2+121\\12r=121-36\\12r=85\\r=\dfrac{85}{12}$

The length of the radius, $r=\dfrac{85}{12}$

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3 years ago

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3. Let sin 21 = 0.358. What is the value of x for cos x=0.358?

r-ruslan [8.4K]

Answer:

$\cos(69)$

Step-by-step explanation:

We will use the co-function identity for sine, where:

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Since sin(21)=0.358=cos(x). This means that:

$21=90-x$

Solve for x. Add x to both sides:

$x+21=90$

Subtract 21 from both sides:

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2 years ago

What is the solution to this system of linear equations?

alexandr1967 [171]

Answer:

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2x + y = 1

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2 years ago

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vivado [14]

Answer:

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Step-by-step explanation:

∠ D and ∠ A are vertically opposite angles and are congruent , then

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3m = 150 ( divide both sides by 3 )

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1 year ago

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