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3 years ago

5

I confused on this one

1 answer:

Simora [160]3 years ago

6 0

I guess the answer is 31 because two sides are the same so 12is the sa,e on the other side and 12+12=24 plus the 7 equals 31cm.

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What is 7-(-19)-18(-19)+18

riadik2000 [5.3K]

Answer:

386

Step-by-step explanation:

8 0

3 years ago

Solve the system by substitution.<br> y = -4x<br> 23 - 5y = 44

spin [16.1K]

<h3><u>Explanation</u></h3>

Given the system of equations.

$\begin{cases} y = - 4x \\ 23 - 5y = 44 \end{cases}$

Substitute y = -4x in the second equation.

$23 - 5( - 4x) = 44 \\ 23 + 20x = 44 \\ 20x = 44 - 23 \\ 20x = 21 \\ x = \frac{21}{20}$

Substitute the value of x in any given equations. I will substitute the value of x in the first equation.

$y = - 4x \Longrightarrow y = - 4( \frac{21}{20} ) \\ y = \cancel{ - 4}( \frac{21}{ \cancel{20}} ) \Longrightarrow y = - \frac{21}{5} \\ y = - \frac{21}{5}$

Answer Check by substituting both values in two equations.

<u>First</u><u> </u><u>Equation</u>

$y = - 4x \Longrightarrow - \frac{21}{5} = - 4( \frac{21}{20} ) \\ - \frac{21}{5} = \cancel{ - 4}( \frac{21}{ \cancel{20}} ) \\ - \frac{21}{5} = - \frac{21}{5} \: \: \: \checkmark$

<u>Second</u><u> </u><u>Equation</u>

$23 - 5y = 44 \\ 23 - 5( - \frac{21}{5} ) = 44 \\23 - \cancel{5}( - \frac{21}{ \cancel{5}} ) = 44 \\ 23 + 21 = 44 \\ 44 = 44 \: \: \: \: \checkmark$

Both equations are true for the value of x and value of y.

<h3><u>Answer</u></h3>

<u> $\begin{cases} x = \frac{21}{20} \\ y = - \frac{21}{5} \end{cases}$ </u>

<u>Coordinate</u><u> </u><u>Point</u><u> </u><u>form</u>

<u> $( \frac{21}{20} , - \frac{21}{5} )$ </u>

5 0

3 years ago

as a member of a music club you can order CDs for $14.99 each. the music clib also charges $4.99 for each shipment the expressio

alina1380 [7]

14.99n + 4.99

If we ordered 3 CDS, we need to replace 3 for n.

14.99(3) + 4.99
44.97 + 4.99
49.96

Answer: $49.96

5 0

3 years ago

Read 2 more answers

A chemist is using 373 millimeters of a solution of acid and water.if 19.9 percent of the solution is acid how many millimeters

vovikov84 [41]

There are 74.227 milliliters of acid in the solution.

Explanation:

The total amount of liquid is 373 milliliters. This is both the acid and water combined i.e amount of liquid + amount of acid = 373 milliliters

If 19.9% of this is acid it means 19.9% of the the entire 373 milliliters is acid. So we calculate how much 19.9% of 373 milliliters is.

19.9% of 373 milliliters = 0.199 × 373 = 74.227 milliliters. So 74.227 milliliters of the entire solution is acid.

3 0

3 years ago

Evaluate the following expression . 2*[4+(12+16)/7

Nataliya [291]

Answer:

16

Step-by-step explanation:

$2 \times (4 + (12 + 16) \div 7 \\ (12 + 16) = 28 \div 7 = 4 + 4 = 8 \\ 2 \times 8 = 16$

3 0

3 years ago