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amid [387]
3 years ago
12

Valentina is trying to decide whether to join her school's swim team. During the summer, the team practices 4 days per week. Eac

h of those days, they practice for 3 hours in the morning and practice again in the afternoon. They practice for a total of 20 hours each week.
Which equation can you use to find h, the length of each afternoon practice in hours?
Question 9 options:

4h+3=20


3h+4=20


3(h+4)=20


4(h+3)=20
Mathematics
2 answers:
Aloiza [94]3 years ago
4 0

Answer:

4

Step-by-step explanation:

AlekseyPX3 years ago
4 0

Answer:

3(h+4)=20

Step-by-step explanation:

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Find a unit vector in the direction of the vector left bracket Start 3 By 1 Matrix 1st Row 1st Column negative 8 2nd Row 1st Col
MrRissso [65]

Answer:

\left[\begin{array}{c}-\frac{8}{\sqrt{117} } \\\frac{7}{\sqrt{117} }\\\frac{2}{\sqrt{117} }\end{array}\right]

Step-by-step explanation:

We are required to find a unit vector in the direction of:

\left[\begin{array}{c}-8\\7\\2\end{array}\right]

Unit Vector, \hat{a}=\dfrac{\overrightarrow{a}}{|\overrightarrow{a}|}

The Modulus of \overrightarrow{a} =\sqrt{(-8)^2+7^2+(-2)^2}=\sqrt{117}

Therefore, the unit vector of the matrix is given as:

\left[\begin{array}{c}-\frac{8}{\sqrt{117} } \\\frac{7}{\sqrt{117} }\\\frac{2}{\sqrt{117} }\end{array}\right]

5 0
4 years ago
Please help me I can’t figure them out
OLga [1]
Where is the question
8 0
4 years ago
-3(-6b+5)? Solve bih
madam [21]

Answer:

18b - 15

Step-by-step explanation:

<u>Step 1:  Distribute </u>

-3(-6b + 5)

(-3 * -6b) + (-3 * 5)

18b - 15

Answer:   18b - 15

<u>If needed solve for b </u>

18b - 15 + 15 = 0 + 15

18b / 18 = 15 / 18

b = 0.8333...

4 0
3 years ago
Read 2 more answers
Hi can you please help me​
astra-53 [7]

Answer:

<h2>Area = 90 cm²</h2><h2>Perimeter = 53 cm</h2>

Step-by-step explanation:

area and perimeter of the given diagram

<u>area = 1/2 * base * height</u>

where base = 15 cm

        height = 12 cm

plugin values into the formula

area = 1/2 * 15 * 12

area = 90 cm²

<u>Perimeter = add up all sides (AB + AC + BC)</u>

where side BC = √(5² + 12²)

                   BC = 13 cm

Perimeter = 25cm + 15 cm + 13 cm

Perimeter = 53 cm

6 0
3 years ago
driving to and from the butterfly garden took 45 minutes each way. Students spent 3 hours in the garden and 30 minutes eating lu
Setler [38]
45 min add 45 min equals 1:30 add 3 3:30 add 30 equals they got vack at 1:00pm
3 0
3 years ago
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