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3 years ago

Whats 3x3+4 use pemdas ?

Mathematics

2 answers:

Romashka [77]3 years ago

8 0

Answer:

Step-by-step explanation:

Ugo [173]3 years ago

5 0

Answer:

Step-by-step explanation:

First, we do 3x3 which is 9.

Then, we do 9+4=13

Hope this helps =]

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Review the steps of the proof of the identity

koban [17]

Answer:

step 2

and then also in step 3 compensating the error in step 2

Step-by-step explanation:

I think I just answered this for another post.

sin(a - b) = sin(a)cos(b) - cos(a)sin(b)

so, step 1 is correct :

sin(A - 3pi/2) = sin(A)cos(3pi/2) - cos(A)sin(3pi/2)

but step 2 suddenly and incorrectly switched that central "-" to a "+".

yes, sin(3pi/2) = -1, but that is still an explicit factor in step 2. so it was not used to flip the central operation from subtraction to addition, and therefore this change was a mistake.

then, in step 3, another error was made by just ignoring the "-" sign of "-1" and still keeping the central "+" operation. this error compensated for the error in step 2 bringing us back by pure chance to the right result.

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2 years ago

Please Help ive been stuck on this for 30 mins now will medal and fan

SOVA2 [1]

C. 486
You just have to replace the letters with numbers, multiply first then add

4 0

3 years ago

Read 2 more answers

How many tiles will be in figure 100? EZ COME UP ON POINTS

Wittaler [7]

<h2>Answer </h2>

$f(100) = 498$

<h2>Explain</h2>

$f(2) = 8$

$f(3) = 13$

$3b - 2b = 13 - 8$

$b = 5$

$f(1) = f(2) - b$

$f(1) = 8 - 5$

$f(1) = 3$

$f (x)= f(1) + (x - 1)b$

$f(100) = 3 + (100 - 1)5$

$f(100) = 3 + (99)5$

$f(100) = 3 + 495$

$f(100) = 498$

#LearnWithBrainly

4 0

3 years ago

A flea jumps from the ground to a height of 30 cm and travels 15 cm horizontally from where it started. Suppose the origin is lo

adelina 88 [10]

Answer:

$y=-\frac{8}{15}x^2+8x$

Step-by-step explanation:

Consider the equation that shows flea's motion is $y=ax^2+bx+c$ .

Since the origin is located at the point from where the flea jumped,

So, $y=ax^2+bx+c$ passes through (0,0).

That is, (0,0) must satisfy $y=ax^2+bx+c$ ,

$0=a(0)^2+b(0)+c$

$\implies c =0$

Now, it travels 15 cm horizontally from where it started.

That is, $y=ax^2+bx+c$ passes through (15,0).

$0=a(15)^2+b(15)+c$

$0=a(225)+b(15)$ (Because c=0)

$225a+15b=0$ ...... (1)

Again, it jumps from the ground to a height of 30 cm,

So, the y-coordinate of vertex of $y=ax^2+bx+c$ is 30.

Now, the x-coordinate of vertex of the quadratic function must be half of the distance from its starting point to final point.

That is, x-coordinate of the vertex = $\frac{15}{2}$ = 7.5,

Thus, vertex = (7.5, 30)

(7.5, 30) must satisfy $y=ax^2+bx+c$

That is, $30=a(7.5)^2+b(7.5)+c$

$30=56.25a+7.5b$

$56.25a+7.5b=30$ ...... (2)

Equation (1) - 2 × equation (2),

225a - 112.5a = -60

112.5a = -60

$\implies a = -\frac{60}{112.5}=-\frac{8}{15}$

From equation (1),

$225(-\frac{8}{15})+15b = 0$

$-120+15b=0$

$15b=120$

$b=8$

Substitute the values of a, b and c in the quadratic equation $y=ax^2+bx+c$ ,

$y=-\frac{8}{15}x^2+8x$

Which is the required quadratic equation.

6 0

3 years ago

Which of the following sets are closed under multiplication? Select all that apply. integers irrational numbers whole numbers po

s2008m [1.1K]

I think the appropriate answer is, the integers, polynomials and whole numbers since of them are closed under multiplication.
Integers are whole numbers, while polynomials are expressions with more than two algebraic terms.

5 0

4 years ago