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3 years ago

10/7×-(4)y=7 whats the answer

Mathematics

1 answer:

zloy xaker [14]3 years ago

7 0

Y=40/7x-7/4 Answer
eliminate everything from the Y.

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Find a.b. a=3i+2j-k, b=4i+5k

Tomtit [17]

Answer: $a\cdot b= 7$

Step-by-step explanation:

We are given

$a=3\hat{i}+2\hat{j}-\hat{k}$

$b=4\hat{i}+5\hat{k}$

They can be written as

$a=3\hat{i}+2\hat{j}+(-1)\hat{k}$

$b=4\hat{i}+0.\hat{j}+5\hat{k}$

Now , the dot product of and b is given by :-

$\Rightarrow\ a\cdot b= (3\hat{i}+2\hat{j}+(-1)\hat{k})\cdot(4\hat{i}+0.\hat{j}+5\hat{k})$

$\Rightarrow\ a\cdot b=3\cdot 4 \cdot\hat{i}\cdot\hat{i}+2\cdot0\cdot\hat{j} \cdot\hat{j}+ (-1)\cdot 5 \cdot \hat{k}\cdot \hat{k}$

$\Rightarrow\ a\cdot b=12 \cdot\hat{i}^2+0-5 \cdot \hat{k}^2$

$\Rightarrow\ a\cdot b=12 \cdot(1)+0-5 \cdot (1)$ [Since $\hat{i}^2=\hat{k}^2=1$ ]

$\Rightarrow\ a\cdot b=12 -5=7$

Therefore , the value of the dot product $a\cdot b= 7$

5 0

3 years ago

Write an equation in point-slope form for the line that passes through (–2, 1) with a slope of 1/4. Giving brainliest!

Colt1911 [192]

Answer:

y=1/4x+1.5

Step-by-step explanation:

Slope is 1/4 and I figured out that the y-intercept point is 1.5y.

I am not exactly sure though

8 0

2 years ago

I need help plz 10 points

Vaselesa [24]

Answer:

87.9

Step-by-step explanation:

$\pi {2}^{2} \times 2 + 2\pi \times 2 \times 5 = 28\pi = 87.9$

5 0

2 years ago

What property does 5(a) = a(5) belong to?

mote1985 [20]

Answer:

Commutative Property for Multiplication

3 0

1 year ago

Read 2 more answers

Tasha is planning an expansion of a square flower garden in a city park. If each side of the original garden is increased by 7 m

12345 [234]

To find the original length you must take away the add-ons. To do so we know that they added 7 and A= l*l (or l squared). They added the 7 to the length so multiply 7*7 (49) subtract your answer from 169 (120) and that's your new area. To find the original length divide by 4 (I believe) and get 30m2

5 0

2 years ago