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3 years ago

I need help I don’t know how to do please help!!!

Mathematics

1 answer:

jeka57 [31]3 years ago

4 0

Answer:

3a2+8a+9

Step-by-step explanation:

since it is an isosceles triangle two sides are equal and for perimeter just add all sides

3a+5+3a+5+3a2+2a-1

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The probability of event A is x, and the probability of event B is y. If the two events are independent, which of these conditio

zzz [600]

If two events are independent, then

$Pr(A\cap B)=Pr(A)\cdot Pr(B)$ .

Use formulas for conditional probabilities:

$Pr(A|B)=\dfrac{Pr(A\cap B)}{Pr(B)},\\ \\ Pr(B|A)=\dfrac{Pr(A\cap B)}{Pr(A)}$ .

For independent events these formulas will be:

$Pr(A|B)=\dfrac{Pr(A\cap B)}{Pr(B)}=\dfrac{Pr(A)\cdot Pr(B)}{Pr(B)}=Pr(A),\\ \\ Pr(B|A)=\dfrac{Pr(A\cap B)}{Pr(A)}=\dfrac{Pr(A)\cdot Pr(B)}{Pr(A)}=Pr(B)$ .

Now in your case $Pr(A)=x,\ Pr(B)=y$ and $Pr(A|B)=x,\ Pr(B|A)=y, Pr(A\cap B)=x\cdot y$ .

This shows that the only correct choice is A.

5 0

4 years ago

Read 2 more answers

In order to find her handicap in bowling, Emma was told to subtract her average A from 200, multiply by 2, and divide by 3. A Wr

Svetllana [295]

Answer:

A: [2(200-x)]/3 B: 31.33333...

Step-by-step explanation:

A: Algebraic expression:

Let's say average = x

So the expression is [2(200-x)]/3

You have to take average away from 200, which is 200-x, you have to multiply that whole expression by 2, and then divide everything by 3.

B: Plug in 153 for x:

2(200-153)/3 and then just solve algebraically

=2(47)/3

=94/3

=31.33333...

5 0

4 years ago

Solve the system by substitution. Check your solution.

postnew [5]

Answer:

(9,126)

Step-by-step explanation:

Make sure x and y are on the same side

$0.5x+0.25y=36\\16x-1y=18$

Eliminate y by multiplying the first equation by 4 then adding both equations together

$2x+1y=144\\16x-1y=18\\18x=162\\x=9$

Plug the x value (9) into one of the equations

$16(9)-1y=18$

Solve

$16(9)-1y=18\\144-1y=18\\144=18+1y\\126=y$

x=9, y=126

(9,126)

8 0

3 years ago

Determine the second derivative evaluated at t=0

enyata [817]

$M(t) = e^{3(e^t-1)}$

then using the chain rule, we have

$M'(t) = e^{3(e^t-1)} \times 3e^t = 3e^{3(e^t-1)+t}$

$M''(t) = 3e^{3(e^t-1)+t} \times (3e^t+1)$

Then

$M''(0) = 3e^{3(e^0-1)+0} \times (3e^0+1) = 3e^0 \times (3+1) = \boxed{12}$

3 0

3 years ago

The height, h, of a plant (in inches) w weeks since it was planted is represented by the equation h=1.2w+3. How many weeks will

alexandr1967 [171]

Answer:

7.5 weeks

Step-by-step explanation:

If you want to find out how long it take for the plant to reach a foot you set up the equation like so:

12=1.2w+3

and solve from there.

12=1.2w+3 Subrtact 3 from both sides

9=1.2w Divide by 1.2 to isolate w

7.5=w Answer is 7.5 weeks

7 0

3 years ago

Read 2 more answers