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9966 [12]
3 years ago
9

Can someone plz help me!!! 5-7?!

Mathematics
2 answers:
defon3 years ago
7 0

Answer:

#5: d=22, #6: m=4\frac1{10}, #7: 2\frac3{11}=z

Step-by-step explanation:

#5:

2\cdot (4\cdot5-3^2)=2\cdot (4\cdot5-3\cdot3)=2\cdot (20-9)=2\cdot11=22

#6:

5\frac25-1\frac3{10}=5\frac4{10}-1\frac3{10}=4\frac1{10}

#7:

\frac{40-15}{5+6}=\frac{25}{11}=2\frac3{11}

enot [183]3 years ago
3 0

Answer:

5. d = 22

6. m = 4\frac{1}{10}

7. z = 2\frac{3}{11}

Step-by-step explanation:

5. d = 2 (4 · 5 - 3^2)

Solving the terms inside the brackets first:

d = 2 (20 - 9)

d = 2 (11)

d = 22


6. m = 5\frac{2}{5} - 1\frac{3}{10}

m = \frac{27}{5} - \frac{13}{10}

By taking LCM:

m = \frac{54 - 13}{10}

m = \frac{41}{10}

m = 4\frac{1}{10}


7. \frac{40-15}{5+6} = z

Taking the denominator to the other side of the equation and multiplying it there:

40 - 15 = z (5 + 6)

25 = 5z + 6z

11z = 25

z = \frac{25}{11}

z = 2\frac{3}{11}

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