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garri49 [273]
3 years ago
8

I don’t know the answer I need help

Mathematics
2 answers:
Sergio039 [100]3 years ago
4 0

Answer:

-11b^2 + 8b - 4

Step-by-step explanation:

(-4b^2 + 6b - 9) - (7b^2 - 2b - 5) =

Drop the first set of parentheses because it is unnecessary. To drop the second set of parentheses, you must distribute the negative sign. That means you must change every sign inside the second set of parentheses.

= -4b^2 + 6b - 9 - 7b^2 + 2b + 5

Now, group like terms.

= -4b^2 - 7b^2 + 6b + 2b - 9 + 5

Finally, combine like terms.

= -11b^2 + 8b - 4

Elenna [48]3 years ago
3 0

Answer:

-11b^2+8b-4

Step-by-step explanation:

We can substitute in our expressions for P and Q to get

P=-4b^2+6b-9\\Q=7b^2-2b-5\\\\(-4b^2+6b-9)-(7b^2-2b-5)

Next, we need to distribute the negative to the values within the parenthesis. Then we can combine like terms in order to get our answer

(-4b^2+6b-9)-(7b^2-2b-5)\\\\-4b^2+6b-9-7b^2+2b+5\\\\-11b^2+8b-4

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Answer:

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Step-by-step explanation:

It was pretty easy I just used a calculator and added the numbers together till I got the right answer.

5 0
3 years ago
Find the percent of increase or decrease from the first number to the second number. 140 to 84
tresset_1 [31]
We can automatically see that we are dealing with a percent decrease because we are going from a smaller to a bigger number. We need to first find what percent of 140the number 84 is. to do this we can set up the following equation:

140/84=100/x (this equation is basically saying if 140 is 100(%) what would 84 be?)

solving for x here gives us x = (84 X 100)/140 = 60, so 84 is 60 percent of 140 which means 140 decreased by 40 percent.

Let me know if I can clear anything else up.


8 0
2 years ago
5. Is arithmetic mean a proper measure of central tendency of data ? 7. Can a set of data, having two modes, have two points of
katovenus [111]

Step-by-step explanation:

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8 0
3 years ago
Whilst shopping, the probability that Caroline buys fruit is 0.7.
Lilit [14]

Answer:

Probability that Caroline buys fruit, a CD or both is 0.76.

Step-by-step explanation:

Let event A = Caroline buys fruit, event B = Caroline buys CD, Ac and Bc are complementary events.

Events AB, ABc, AcB and AcBc are jointly exhaustive and disjoint, hence P(AB) + P(ABc) + P(AcB) +P(AcBc) =1.

Events A and B independent, hence Ac and Bc independent too and probability P(AcBc) = P(Ac)*P(Bc) = (1 - P(A))(1-P(B)) = 0.6*0.4 = 0.24.

Required probability P(AB + ABc + AcB ) = P(AB) + P(ABc) + P(AcB) = 1- P(AcBc) = 1 - 0.24 = 0.76.

3 0
2 years ago
Read 2 more answers
Wat is <br><br> $3.459B<br> 2.443B<br> $55.838B<br> 85.965B <br> in dollars pls
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Answers:

$3,459,000,000

$2,443,000,000

$55,838,000,000

$85,965,000,000

8 0
2 years ago
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