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leonid [27]
3 years ago
14

What 57% of 690? Help me find the percentage!!

Mathematics
2 answers:
Dvinal [7]3 years ago
4 0

Answer:

393.3

hope that helps you!

natulia [17]3 years ago
4 0

Answer: 393.3

Step-by-step explanation: .57 times 690 or 57% times 690. The word, of means to multiply.

Hope this helps! :)

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Can someone help me understand how to do this quadratic math problem
Juliette [100K]

Answer:

  put all of the expressions into the same form, such as standard form

Step-by-step explanation:

When you're trying to determine whether one expression is equivalent to another, you need to put both of the expressions into the same form. This will generally require some algebraic manipulation using the rules of equality.

Here, you're given a quadratic in standard form. From what we can see of the one partial answer, some of the choices are in vertex form. To determine if they are equivalent, you can do either of two things ...

  1. Put the given expression into vertex form
  2. Expand the answer choice to put it in standard form

___

<em>For multiple-choice questions</em> of this type, it is often sufficient to look at one or two terms of the different equations. That is usually all it takes to separate a good answer from a bad one.

You can start with the x^2 term. Any answer choice that has an x^2 coefficient different from 1 will be rejected.

Next, you can look at the sign of the x term. Any answer choice that doesn't have a positive x term will be rejected.

Finally, you can look a the constant term. Any answer choice that doesn't have a constant term of +4 will be rejected.

___

As it happens, the given equation is a perfect square, so one equivalent is ...

  y = (x +2)^2

_____

When working with quadratics, it can be helpful to memorize a couple of the ways they can be written:

  (x +b)^2 = (x^2 +2bx + b^2)

This is a special case of ...

  (x +a)(x +b) = x^2 +(a+b)x + ab

3 0
3 years ago
Help please stuck again .
xenn [34]
If the polygons are similar, then the top side is equal to one half of the left side.
Since side (x -1) = 8, then x = 9.


3 0
3 years ago
What is 3gh 2 x 4g 3h 3
Alexus [3.1K]

Answer:

(3•22g4h5)

Step-by-step explanation:

Step 1:  ((3gh2 • 4) • g3) • h3

Step 2:   ((3•22gh2) • g3) • h3

Step 3:   3.1 h2 multiplied by h3 = h(2 + 3) = h5

Final answer:   (3•22g4h5)

(IF THIS HELPED PLEASE GIVE BRAINLIEST OR RATE IT 5 STARS!)

5 0
3 years ago
h = -16t^2 + 541? its been forever since i had to do this and frankly I'm completely lost. please if you answer this can you tea
natta225 [31]
A = -16  b = 0  c = 541
Use the quadratic formula which is
x = [-b +- sq root (b^2 -4*a*c)] / 2*a
x = [-0 +-sq root (0 -4*-16*541)] / 2 * -16
x = + - sq root (0 -4*-16*541) / -32
x = + - sq root (34,624) / -32
x = + - 186.075 / -32

x1 = 186.075 / -32 = <span> <span> <span> -5.81484375 </span> </span> </span>
x2 = -186.075 / -32 = <span> <span> <span> 5.81484375 </span> </span> </span>


7 0
3 years ago
Guys, please help me faster will receive a Brainliest award if you answer my 2 of the math questions with the best given answers
Zolol [24]

Answer:

<u><em>Question 10.</em></u>

Length of the side of the square = \sqrt{441} = 21

By Pythagoras' Theorem,

Hypotenuse = \sqrt{21^{2} + 20^{2} } (H > 0)

                     = 29 m

Ans: 29 m

<u><em>Question 11.</em></u>

By Pythagoras' Theorem,

Length of longer side of 42 km = 42- \sqrt{18^{2} - 15^{2} } (L > 0)

                                                                     = 32.050 km (5 s.f.)

By Pythagoras' Theorem,

Length of the unknown side = \sqrt{32.050^{2} + 15^{2}  } (L > 0)

                                               = 35.4 km (3 s.f.)

Ans: 35 km

<u><em /></u>

3 0
2 years ago
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