Morgan writes the expression 5(2 + 1) 2 + 3 on the board.

Mr. Dolezal says the first step is to evaluate 12. Explain Mr. Dolezal’s mistake. Then, evaluate the expression.

Answers

Answer 1

Answer: he didn’t follow PEMDAS which is the an acronym for the order of operations. according to pemdas the first step is parenthesis (which is the p in pemdas) there fore the first step is to add the 1 and the 2
then since there are no exponents you multiply so you multiple 5(3) which is 15
then you can add all the number left to right
so 15+2+3= 20
so the answer is 20
hope this helped
let me know if you have any questions

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Max travels to see his brother's family by car. He drives 216 miles in 4 hours.What is his rate in miles per hour? Use a double number line to show your work.

Answers

Answer:

54 mph

Step-by-step explanation:

8(3a + 7) = 8+3(6a - 6)

Answers

Answer:

a=11

Step-by-step explanation:

8(3a + 7) = 8+3(6a - 6)

24a+56=8+18a-18

24a-18a+56=8+18a-18a-18

6a+56=8-18

6a+56=-10

6a+56-56=-10-56

6a=-66

6a/6=-66/6

a=-11

Answer:

a = -11

Step-by-step explanation:

8(3a + 7) = 8+3(6a - 6)

= -11

Of the 8 students in the chess club, three will represent the club at an upcoming competition. How many different 3-person teams can be formed from the 8 students?

Answers

I think that this is a combination problem. From the given, the 8 students are taken 3 at a time. This can be solved through using the formula of combination which is C(n,r) = n!/(n-r)!r!. In this case, n is 8 while r is 3. Hence, upon substitution of the values, we have

C(8,3) = 8!/(8-3)!3!
C(8,3) = 56

There are 56 3-person teams that can be formed from the 8 students.

Solve each equation 1) log5-log2x=1 2) 2log(x+1)=5

Answers

$1)\nlog5-log2x=1;\ D:x > 0\n\nlog(5:2x)=log10\n\nlog(5)/(2x)=log10\iff(5)/(2x)=10\n\n20x=5\ \ \ /:20\n\nx=(1)/(4)\in D$

$2)\n2log(x+1)=5;\ D:x+1 > 0\to x > -1\n\nlog(x+1)^2=log10^5\iff(x+1)^2=10^5\n\nx+1=-√(10^5)\ \vee\ x+1=√(10^5)\n\nx+1=-√(10^4\cdot10)\ \vee\ x+1=√(10^4\cdot10)\n\nx=-100√(10)-1\notin D\ \vee\ x=100√(10)-1\in D$

If the cost of an orange is 18 kobo, what is the cost of 185 orange?

Answers

Answer:

1 orange = 18

185 oranges = x

(cross multiply)

18*185 = x

x= 3,330 kobo

hope this helps

Answer:

3330 kobo

Step-by-step explanation:

We know that one orange costs 18 kobo and we want to find the cost of 185 oranges. We will need to use ratio's for this question. A ratio is to show how much of one thing there is compared to another. So,

1 orange : 18 kobo

185 oranges = ? kobo

185 ÷ 1 = 185

185 × 18 = 3330 kobo

The cost of 185 oranges is 3330 kobo considering that one orange is 18 kobo.

? M/S = 7.2 km/h ------ PLEASE HELP