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lutik1710 [3]
3 years ago
5

The expression 3(x-9) is equivalent to

Mathematics
1 answer:
Inessa05 [86]3 years ago
8 0
The answer to this question would be D. 3(x)-3(9)
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A car radiator needs a 80% antifreeze solution. The radiator now holds 15 liters of a 70% solutions. How many liters of this sho
slavikrds [6]
So... the radiator has 15 liters of 70% antifreeze.. but needs an 80% antifreeze

well, so, you need to drain some and put some with higher percentage, seems to be, you will end up at the same 15 liters, possible the radiator's capacity, of 80% antifreeze

so, the same amount going out, of 70% is the same amount going in, of 100% antifreeze

now.. let's use the decimal format for the percents, or 70% is 70/100 or 0.7 and so on
\bf \begin{array}{lccclll}
&amount&concentration&
\begin{array}{llll}
concentration\\
amount
\end{array}\\
&-----&-------&-------\\
\textit{70\% sol'n, out}&x&0.7&0.7x\\
\textit{100\% sol'n, in}&x&1.00&x\\
\textit{current 70\% sol'n}&15&0.7&10.5\\
-----&-----&-------&-------\\
mixture&15&0.8&12
\end{array}

so.. let's subtract, from the current solution, 0.7x and add 1x or x, our antifreeze concentration amount, should be 12 though

10.5 - 0.7x + x = 12

solve for "x"

3 0
3 years ago
Read 2 more answers
I need help with this question.
ahrayia [7]

Answer:

59

Step-by-step explanation:

We know that all the angles must add up to 180

so we have

38+2b-20+b-15=180

solve for b

3b+3=180

3b=177

b=59

8 0
3 years ago
Read 2 more answers
17) Find the surface area of the right triangular prism shown below:<br> 5<br> 2<br> 5/2<br> 3/2
harkovskaia [24]

Answer:

D

Step-by-step explanation:

They didn't provide the number for one of the faces btw..

7 0
2 years ago
What is the value of the expression 3a+b2 when a=14 and b=32 ?
soldi70 [24.7K]

Answer:

106

Explanation:

3a+b2

Substitute the values for the variables:

3(14) + 2(32)

Solve:

3(14) + 2(32)

42 + 64

106

5 0
3 years ago
Match each quadratic function to its graph.
Ede4ka [16]

Answer:

You have to have the graph to answer it.

Step-by-step explanation:

6 0
3 years ago
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