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algol [13]
3 years ago
7

Liam bought 3 donuts for $5 each and 10 cookies for $2 each from a bakery for a party. At the checkout counter, he was given a d

iscount of $7.
Mathematics
1 answer:
Bas_tet [7]3 years ago
4 0

Answer: donuts = $15 and cookies = $20 and so 20+15=35-7=28

Step-by-step explanation:

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Answer please no links or files
Naddik [55]

Answer:

120

Step-by-step explanation:

4 0
3 years ago
You need a 50% solution. On hand, you have a 200 mL of a 35% alcohol mixture. You also have 70% alcohol mixture. How much of the
CaHeK987 [17]

Answer:

150 mL

Step-by-step explanation:

We need a mixture that is at 50%, now we have 200 mL at 35% and another mixture that is at 70%, that is, we must calculate how much of this mixture is added, by the following equation

200 * 35% + x * 70% = 50% (x + 200)

70 + 0.7 * x = 0.5 * x + 100

0.7 * x - 0.5 * x = 100 - 70

0.2 * x = 30

x = 30 / 0.2

x = 150

150 mL must be added so that the mixture is 50%.

6 0
3 years ago
Which of the following are solutions to the equation below? Check all that apply. 4x2 - 81 = 0
Vinil7 [7]

Answer:

9/2 -9/2

Step-by-step explanation:

Hope this helps! ;-)

8 0
2 years ago
Which of the following are solutions to 2x2 – 8x - 90? Select all that apply.
Bond [772]

Answer:

x=-5, x=9

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form

ax^{2} +bx+c=0

is equal to

x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}

in this problem we have

2x^{2} -8x-90  

equate to zero

2x^{2} -8x-90=0  

so

2=-1\\b=-8\\c=-90

substitute in the formula

x=\frac{-(-8)\pm\sqrt{-8^{2}-4(2)(-90)}} {2(2)}

x=\frac{8\pm\sqrt{784}} {4}

x=\frac{8\pm28} {4}

x=\frac{8+28} {4}=9

x=\frac{8-28} {4}=-5

therefore

The solutions are x=-5, x=9

6 0
3 years ago
Multi-step equation help me out with it <br><br><br><br>-3x + 25 + x + 21 = 2
julsineya [31]

Answer:

22

Step-by-step explanation:

Put all the other numbers at the right side of the equation.

-3x + 25 + x + 21 = 2 is the same as -3x + x = -44

-2x = -44

-x = -22

x = 22

4 0
2 years ago
Read 2 more answers
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