Cecilia says she can use addition to solve multiplication problems. is cecilia correct?

Answers

Answer 1

Answer: she is correct you can just add the number you are trying to multiply various times like for example 3x32 it can just be 32+32+32

Answer 2

Answer: Yes. For example, if you are trying to get the answer to the multiplication problem 3x2, the answer would be 6 and if you did addition, you would be adding 3+3 and get the same answer. 3x5 would be 3+3+3+3+3.

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Cost A=0.6489

take the inverse cosine of both sides

Answers

I am not quite sure what the question asks for,
But this is what i assume it wants:

Cos A= 0.6489
In this given one, we basically find the size of the angle A
we do cosine inverse on both sides to get the size of the angle A
$cos^(-1)$ : It looks like this in the calculator
$cos^(-1)$ × cos A= $cos^(-1)$ (0.6489)
( $cos^(-1)$ and cos cancels out)
A= $cos^(-1)$ (0.6489)
A=49.54°
check:
cos 49.54=0.6489 (its right!)

If ∠BAC = 17° and ∠CED = 17° are the two triangles, ΔBAC and ΔCED similar? If so, by what criterion?A) yes, by AA similarity criterion
B) yes, by SAS similarity criterion
C) yes, by SSA similarity criterion
D) no, not possible to tell.

Answers

Answer:

Option A is correct.

Yes, by AA similarity criterion

Step-by-step explanation:

AA(Angle-Angle) Similarity Criterion states that if two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.

In ΔBAC and ΔCED

$\angle BAC = \angle CED = 17^(\circ)$ [Angle] [Given]

$\angle C = \angle C$ [Angle] [Common angle]

Therefore, by AA similarity criterion;

$\triangle BAC \sim \triangle CED$

Therefore, ΔBAC and ΔCED are similar by AA similarity criterion.

If ∠BAC = 17° and ∠CED = 17° are the two triangles, ΔBAC and ΔCED similar? If so, by yes, by AA similarity criterion

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

9. A sector of a circle has central angle $(\pi )/(4)$
and area
$(49\pi)/(8)$

${cm}^(2)$
. Find the radius of the circle

Answers

Answer:

Step-by-step explanation:

Begin with the formula for the area of a sector:

$A=(\theta)/(2\pi)*\pi r^2$ and we are given everything except the radius, r. Filling in what we know:

$(49\pi)/(8)=((\pi)/(4) )/(2\pi)*\pi r^2$ and then start the simplification process. I began by dealing with the fraction over a fraction thing, which simplifies the equation to:

$(49\pi)/(8)=(1)/(8)\pi r^2$ then isolate the r-squared:

$(8(49\pi))/(8\pi)=r^2$ . Canceling out the π's and the 8's leaves us with simply

r² = 49 so

r = 7

Simplify the expression. -3/8 - -1/102/9

-19/40

-3/8

19/40

Answers

Answer: 19/40

Step-by-step explanation: first we need the values in the numerator, so we can multiply in X where you multiply the denominators with numerator of the other value in the equation finally we resolve simple equation between both numerator, so the numerator equations will be.

(-10) * (-3) = 30

(-8) * ( -1) = 8

then we get this values in the numerator

30 + 8 = 38

in the denominator we only need to multiply both values.

(-8) * (-10) = 80

after we divide each result between 2

numerator 38/2 = 19

denominator 80/2 = 40

after this, we can place the numerator and the denominator into the equation and we get the following result

19/40

How much would $100 invested at 8% interest compounded continuously be worth after 15 years?

Answers

The correct formula to use for continuous compounding is:
$A=Pe^(rt)$
where the exponential number e is the base of natural logarithms.
$A=100* e^{(0.08*15)=332.01$
So the amount after 15 years is $332.01

Answer:

$332.01 is correct via a p e x

Step-by-step explanation:

Write a real world situation that would representby the system y=3x +20 and y=5x + 10

Answers

there are 2 car rental companies
the first one charges 3 dollars per day you drive plus a 20 dollar insurance fee

the second one charges 5 dollars per day and a 10 dollar insurance fee
y=cost
x=days

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