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chubhunter [2.5K]
3 years ago
9

Which step is the first incorrect step in the solution shown below?

Mathematics
1 answer:
kap26 [50]3 years ago
8 0

Answer:

A

Step-by-step explanation:

you must distribute the 3 into the parenthsis first.

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Ethan buys a video game on sale. If the video game usually costs $39.99, and it was on sale for 20% off, how much did Ethan pay.
Firlakuza [10]

Answer: $31.99


Step-by-step explanation:

So, it is originally $39.99, so first we convert 20% to a decimal, which is 0.2.

Then we do 39.99 * 0.2 to find how much money was taken off.

39.99 * 0.2 = 7.998, or $8

Now, we do the original dollar amount, $39.99, minus the discount, $8, which equals $31.99.

5 0
3 years ago
Read 2 more answers
Graph the inequality in the coordinate plane negative 3x + 2y​
Aloiza [94]

Answer:

3x+2y

Step-by-step explanation:

you would count 3 to the right on the flat line, and on the line that goes straight up and down, you would count 2 going up and you would plant a dot where they meet on the graph

8 0
3 years ago
Find the solution of the differential equation that satisfies the given initial condition. (du)/(dt) = (2t + sec^2 t)/(2u), u(0)
Delicious77 [7]
Ah okay so in differential equations you usually want the top variable isolated. To do this, multiply by dt and 2u and you get
2udu = 2t + { \sec(t) }^{2} dt
Now just integrate both sides. The integral of 2u with respect to u is u². The integral of (2t + sec²(t) with respect to t is t² + ∫sec²(t)dt. The last part is just tan(x) because d/dt(tan(t)) is sec²(t) so just integrating gets us back. Now we have
{u}^{2}   + c =  {t}^{2}  +  \tan(t)  + k
Where c and k are arbitrary constants. Subtracting c from k and you get
{u}^{2}  =  {t}^{2}  +  \tan(t)  + b
Where b is another constant. To find b, just plug in u(0) = -1 where u is -1 and t is 0. This becomes
1 =  \tan(0)  + b
tan(0) is 0 so b = 1. Take the plus or minus square root on both sides and you finally get
u =  \: { {t}^{2} }  +  \tan(t)  + 1
But Brainly didn't let me do but juat remember there is a plus or minus square root on the left.
3 0
3 years ago
A store offers 20% off all items. If x is the original purchase price, which expression represents the final price with the disc
Keith_Richards [23]

Answer:

20%-X=a

Step-by-step explanation:

So if there is a toy that cost $50 and it was 20% off  it would then cost $40

5 0
2 years ago
Helppppp !!!!!! <br><br>8^6 ÷ 8^7<br><br>A. 8^0<br>B. 8^1 <br>C. 8^5<br>D. 8^-1<br>E. 8^10​
MArishka [77]

8^6 ÷ 8^7 = 8^{6-7} = 8^{-1}

<h3>CMIIW</h3>
3 0
2 years ago
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