2 years ago

Please solve (15 points) (brainliest)

Mathematics

2 answers:

klemol [59]2 years ago

7 0

I think it would be 9

Vedmedyk [2.9K]2 years ago

5 0

Root(81)

root(9)*root(9)

3 * 3

9

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a coin is tossed and a die is rolled. Find the probability of tossing a tail and then rolling a number greater than 2

rodikova [14]

Answer:

1/3; 33% chance

Step-by-step explanation:

1/2 (prob. of tossing tails) * 2/3 (prob of rolling < 2) = 1/3

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3 years ago

SOLVING SYSTEMS OF EQUATIONS BY SUBSTITUTION. 1. 2x+3y=1 -3x+y=15

ohaa [14]

$2x+3y=1 \\
-3x+y=15 \\ \\
\hbox{from the 2nd equation:} \\
-3x+y=15 \\
y=15+3x \\ \\
\hbox{substitute 15+3x for y in the 1st equation:} \\
2x+3(15+3x)=1 \\
2x+45+9x=1 \\
9x+2x=1-45 \\
11x=-44 \\
x=-4 \\ \\
\hbox{solve one of the equations for y}: \\
2x+3y=1 \\
2 \cdot (-4) + 3y=1 \\
-8+3y=1 \\
3y=1+8 \\
3y=9 \\
y=3 \\ \\
\hbox{the answer:} \\
x=-4 \\
y=3$