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Y_Kistochka [10]

3 years ago

7

If i had 42 granola bars how many boxes whould I need?

1 answer:

Luda [366]3 years ago

4 0

Answer:

mmmmmm

Step-by-step explanation:

you would most prolly have a lot of gronola bars

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Select the assumption necessary to start an indirect proof of the statement. If 3a+7 < 28, then a<7.

pashok25 [27]

When applying indirect proofs, we assume the negation of the conclusion is true, and show that this assumption would lead to nonsense, or contradiction.

In our case we assume a is not smaller than 7, that is we assume a≥7.

a≥7 then, multiplying both sides by 3:
3a≥21, then, adding both sides 7:

3a+7≥28,

which is a contradiction because 3a+7 is smaller than 28.

So our assumption is wrong, which means the opposite of it is correct.

Answer: assume a≥7

7 0

3 years ago

(10-4)+20 divided by 10?

Luba_88 [7]

Answer:

8

Step-by-step explanation:

(10-4)+20/20

6+20/10

6+2

8

6 0

3 years ago

(Please answer soon as possible) At the beginning of the day the stock market goes up 60 3/4 points and stays at this level for

Svet_ta [14]

Answer:

it is 2766628276262626828373636737 points

Step-by-step explanation:

no explanation needed lol

3 0

3 years ago

Read 2 more answers

Solve (x-3)^2=5<br> A. x=5+√3<br> B. x=-3+√5<br> C. x=3+√5<br> D. x=8 and x=-2

kodGreya [7K]

Answer:

A

Step-by-step explanation:

we should first find the value of x.

4 0

3 years ago

Read 2 more answers

A golfer keeps track of his score for playing nine holes of golf (half a normal golf round). His mean score is 8080 with a sta

solniwko [45]

Answer:

Therefore the mean and standard deviation of his total score if he plays a full 18 holes are 160 and $11\sqrt2$ respectively.

Step-by-step explanation:

Given that,

For the first 9 holes X:

E(X) = 80

SD(X)=13

For the second 9 holes Y:

E(Y) = 80

SD(Y)=13

For the sum W=X+Y, the following properties holds for means , variance and standard deviation :

E(W)=E(X)+E(Y)

and

V(W)=V(X)+V(Y)

⇒SD²(W)=SD²(X)+SD²(Y) [ Variance = (standard deviation)²]

$\Rightarrow SD(W)=\sqrt{SD^2(X)+SD^2(Y)}$

∴E(W)=E(X)+E(Y) = 80 +80=160

and

∴ $SD(W)=\sqrt{SD^2(X)+SD^2(Y)}$

$=\sqrt{11^2+11^2}$

$=\sqrt{2.11^2}$

$=11\sqrt2$

Therefore the mean and standard deviation of his total score if he plays a full 18 holes are 160 and $11\sqrt2$ respectively.

4 0

3 years ago