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2 years ago

6

Sheena wants to simplify the expression 7(4x + 2y) - 6x + 3. Tell whether each step is the first step she should take by selecti

ng Yes or No.

1 answer:

sdas [7]2 years ago

6 0

Answer:

2 2 + 1 4 + 3

Step-by-step explanation:

7 ( 4 + 2 ) − 6 + 3

2 8 + 1 4 − 6 + 3

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Runner A completes 12 laps around a track in 22 minutes. Runner B completes 8 laps in 15 minutes. Which runner had a greater ave

castortr0y [4]

Answer:

2 divided by 22 equals 0.55. 8 divided by 15 equals 0.53. So runner A had a greater average speed.

Step-by-step explanation:

7 0

1 year ago

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How much bigger is the Sum of first 50 even numbers than the sum of first 50 odd numbers?

Lunna [17]

Answer:

50

Step-by-step explanation:

Sum Even numbers

n = 50

d = 2

a1 = 2

The last number is

an = a1 + (n-1)d

an = 2 + (50 - 1)*2

an = 2 + 49 * 2

an = 2 + 98

an = 100

Sum of the even numbers

Sum = (a1 + a50)*n/ 2

Sum = (2 + 100)*50/2

sum = 102 * 25

sum = 2550

Sum of the first 50 odd numbers

a1 = 1

n = 50

d = 2

l = ?

Find l

l = a1 + (n - 1)*2

l = 1 + 49*2

l = 99

Sum

Sum = (1 + 99)*50/2

Sum = 2500

The difference and answer is 2550 - 2500 = 50

7 0

2 years ago

Given the vectors, a=3i+4j, b=-2i+5j, c=10i-j, d=-1/3i+5/2j, find -0.4a-0.3b+0.2d=?

sveta [45]

Answer:

$-\frac{2}{3}i - \frac{13}{5}j$

Step-by-step explanation:

-0.4(3i + 4i) - 0.3(-2i + 5j) + 0.2(- $\frac{1}{3}i$ + $\frac{5}{2}$ j)

-1.2i - 1.6j + 0.6i - 1.5j - $\frac{0.2}{3}$ i + 0.5j

Converting to fraction form;

$-\frac{6}{5}i + \frac{3}{5}i - \frac{1}{15}i - \frac{8}{5}j - \frac{3}{2}j + \frac{1}{2} j$

<u>Solving the i part;</u>

$\frac{-18i + 9i - i}{15}$ = $-\frac{2}{3}i$

<u>Solving the j part;</u>

$\frac{-16j-15j+5j}{10} = -\frac{13}{5}$ j

So -0.4a - o.3b + 0.2d = $-\frac{2}{3}i$ - $\frac{13}{5}j$

6 0

2 years ago

NO LINKS OR ELSE YOU'LL BE REPORTED! Only answer if you're very good at math.

frosja888 [35]

Answer:

b

Step-by-step explanation:

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2 years ago

Identify the solution for the system of equations graphed here.

Allushta [10]

The answer is c. (1,-1)

7 0

2 years ago

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