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svp [43]
3 years ago
9

(3a+2.5b)^2=9a^2+6.25b^2+* Please help before Thursday

Mathematics
1 answer:
Anon25 [30]3 years ago
5 0

Step-by-step explanation:

We have (x + y)² = (x + y)(x + y) = x² + 2xy + y².

Let x be 3a and y be 2.5b.

Therefore (3a + 2.5b)²

= (3a)² + 2(3a)(2.5b) + (2.5b)²

= 9a² + 15ab + 6.25b².

Hence the '*' sign should be replaced with 15ab.

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Carter Road his bike 9/10 of a mile from his house to his grandmothers house. On his way back home, he rode 3/8 of a mile before
jek_recluse [69]

Answer:

Step-by-step explanation:

Carter rode his bike 9/10 of a mile from his house to his grandmothers house. This means that the distance from Carter's house to his grandmother's house is 0.9 miles. On his way back home, he rode 3/8 of a mile before the tyre on his bike went flat. This means that he rode 0.375 miles before his tyre went flat. The distance he must walk before he gets home will be the total distance from home minus the distance that he rode. It becomes

0.9 - 0.375 = 0.575 miles

3 0
3 years ago
The mathematics department of a college has 6 male professors, 9 female professors, 5 male teaching assistants, and 6 female tea
Hitman42 [59]

Given:

6 male professores

9 female professores

5 male teaching assistants

6 female teaching assistants

Sol:.

N(A\text{ or B)=N(A)+N(B)-N(A and B)}

N (professors)

\begin{gathered} =6+9 \\ =15 \end{gathered}

N(Male)

\begin{gathered} =6+5 \\ =11 \end{gathered}

N(professors and male)

=6

N(professors OR male) = N(professors) + N(males) -N(professor OR male)

\begin{gathered} N(\text{ Professors OR male)=15+11-6} \\ =20 \end{gathered}

N(People to choose from)

\begin{gathered} =6+9+5+6 \\ =26 \end{gathered}

Then probablitiy is:

\begin{gathered} =\frac{20}{26} \\ =\frac{10}{13} \end{gathered}

Then the probability is 10/13

6 0
1 year ago
A Bag contains eight titles labeled A,B,C,D,E,F,G, and H. One title will be randomly picked. What is the probability of picking
Lynna [10]

Answer:

1/6

Step-by-step explanation:

A and E are vowels so you minus it by 8, which makes it 6.

4 0
3 years ago
Read 2 more answers
PLEASE PLEASE HELP ME QUICK!!!!
Greeley [361]
U have a solid line...means there is an equal sign in the problem...so that eliminates 2 of them right away...so A and D are incorrect

it is shaded below the line....this means it is less then...that eliminates option C leaving u with only one answer choice

so ur answer is : B. y is less then or equal to x
3 0
3 years ago
Read 2 more answers
CAN SOMEONE PLEASE HELP ME SOLVE THESE ASAP
Mariulka [41]

so for the 1st one triangle is 8

diamond is 3

and star is 11

the second one star is 5

diamond is 5

and triangle is 2 again

and for the last one well try to do it yourself and if you cant do it comment on this =)

8 0
3 years ago
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