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3 years ago

What is the answer to 15a + 9 =

Mathematics

2 answers:

Elena-2011 [213]3 years ago

5 0

Answer:

Step-by-step explanation:

Use distributive property

15a + 9 = 3*5*a + 3*3

= 3 (5a + 3)

Alex777 [14]3 years ago

3 0

Answer:

$a=-\frac{3}{5}$

Step-by-step explanation:

$15a-9=0\\\\15a=-9\\\\a=-\frac{9}{15} \\\\a=-\frac{3}{5}$

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2 years ago

The perimeter of the isoceles triangle is 54. The ratio of the leg to the base is 7:4. Find the length of the base

Norma-Jean [14]

9514 1404 393

Answer:

12 units

Step-by-step explanation:

The ratio of the base to the other sides is ...

4 : 7 : 7

The perimeter is a total of 4 +7 +7 = 18 ratio units, so each ratio units stands for 54/18 = 3 length units.

The base length is then ...

(4 ratio units)(3 length units/ratio unit) = 12 length units

4 0

2 years ago

Solving by elimination 5x+2y= -3 3x+3y=9 please help me solve x and y

-Dominant- [34]

1) -3(5x+2y=-3)⇒ -15x-6y=9
⇒ -9x=27
2(3x+3y=9)⇒ 6x+6y=18

2) -9x/-9=27/-9 ⇒ x=-3

3) 3(-3)+3y=9⇒ -9+9+3y=9+9⇒ 3y/3=18/3⇒ y=6

Answer: (-3,6)

Reasoning:
Step 1) In order to eliminate, first I had to multiple the first equation by -3 and the second by 2 so that when combining the equations y would cancel each other out so that I could solve for x. Note: There are many combinations as to how you could multiple the equations so that either the x or y would cancel out.

Step 2) Once y is eliminated, solve for x.

Step 3) Now plug x back into one of the original equations and solve for y. Note: Plug x back into one of the original equations, not the equations that were changed by multiplication,

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3 years ago

Write two decimals that are equivalent to 0.9

Maurinko [17]

0.90 and I think .9 is another I'm not sure but I tried

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2 years ago

Read 2 more answers

A special deck of cards has 5 red cards, and 4 purple cards. The red cards are numbered 1, 2, 3, 4, and 5. The purple cards are

True [87]

Answer:

a. 9

b. 4/9 or 0.444

Step-by-step explanation:

R=red card={R1,R2,R3,R4,R5}

E=even card={R2,R4,P2,P4}

n(R)=5

n(E)=4

There 5 red and 4 purple card so, the sample space would be

Sample space=S={R1,R2,R3,R4,R5,P1,P2,P3,P4}

number of elements in sample space=n(S)=9

So, the number of elements in the sample space are 9.

P(E)=n(E)/n(S)

P(E)=4/9 or 0.444

Thus, the probability of an even numbered card is 0.444.

4 0

3 years ago