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3 years ago

Plz give me explanation how to solve

Mathematics

1 answer:

skelet666 [1.2K]3 years ago

4 0

120 people who all need 1 drink, so if each drink needs .5 cups of concentrate you will do 120d × 0.5 = 60 total cups of concentrate. if you then set up a fraction, you could cross multiply to get the answer, but I cant do fractions here so I'll say this: if every 5 cups of concentrate gives 19 cups of water, then you divide 60 cups by 5 cups to see how many "batches" of this recipie you will need, you get 12 batches, so 12 x 19 (cups of water per batch) to get 218 ( I think, check my math with a calculator

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Jonah baked a berry pie. The recipe called for 9 ounces of blackberries, 10 ounces of raspberries, and 12 ounces of strawberries

3241004551 [841]

Answer:

Step-by-step explanation:

He bought 1, 12 ounce container for each of the set of berries. The blackberries needed 9 but he had 12 so you take the 9 away from the 12 and you are left with 3 you do the same with the raspberries and you are left with 2 then the strawberries are already at 12 ounces so you add up the 3 and the 2 and you get 5.

8 0

3 years ago

Which of the expressions are NOT polynomials? Check all that apply.

Tomtit [17]

the expressions that are NOT polynomials
A. x^2-(square root of x)-3
C. 5x^1/2 + 4x^2
E. x^2-x-12/x+3
(method: check polynomials lesson)

3 0

3 years ago

Read 2 more answers

All vectors are in Rn. Check the true statements below:

Oduvanchick [21]

Answer:

A), B) and D) are true

Step-by-step explanation:

A) We can prove it as follows:

$Proy_{cv}y=\frac{(y\cdot cv)}{||cv||^2}cv=\frac{c(y\cdot v)}{c^2||v||^2}cv=\frac{(y\cdot v)}{||v||^2}v=Proy_{v}y$

B) When you compute the product Ax, the i-th component is the matrix of the i-th column of A with x, denote this by Ai x. Then, we have that $||Ax||=\sqrt{(A_1 x)^2+\cdots (A_n x)^2}$ . Now, the colums of A are orthonormal so we have that (Ai x)^2=x_i^2. Then $||Ax||=\sqrt{(x_1)^2+\cdots (x_n)^2}=||x||$ .

C) Consider $S=\{(0,2),(2,0)\}\subseteq \mathbb{R}^2$ . This set is orthogonal because $(0,2)\cdot(2,0)=0(2)+2(0)=0$ , but S is not orthonormal because the norm of (0,2) is 2≠1.

D) Let A be an orthogonal matrix in $\mathbb{R}^n$ . Then the columns of A form an orthonormal set. We have that $A^{-1}=A^t$ . To see this, note than the component $b_{ij}$ of the product $A^t A$ is the dot product of the i-th row of $A^t$ and the jth row of $A$ . But the i-th row of $A^t$ is equal to the i-th column of $A$ . If i≠j, this product is equal to 0 (orthogonality) and if i=j this product is equal to 1 (the columns are unit vectors), then $A^t A=I$

E) Consider S={e_1,0}. S is orthogonal but is not linearly independent, because 0∈S.

In fact, every orthogonal set in R^n without zero vectors is linearly independent. Take a orthogonal set $\{u_1,u_2\cdots u_p\}$ and suppose that there are coefficients a_i such that $a_1u_1+a_2u_2\cdots a_nu_n=0$ . For any i, take the dot product with u_i in both sides of the equation. All product are zero except u_i·u_i=||u_i||. Then $a_i||u_i||=0$ then $a_i=0$ .

5 0

4 years ago

1+1+1+1+1+1+1+1+1+1 who would like to be my friend 1+1+1+1+1+1+1+1

ycow [4]

Answer:

i would :)))))

Step-by-step explanation:

5 0

3 years ago

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Jay earns $8 an hour when he works at his uncle’s store. He earns $9 an hour when he does yard work for his neighbor. Which expr

algol13

Answer:

8u + 9v

Step-by-step explanation: This would be the expression that can determine how much Jay earns within a week because it expresses both kinds of income.

4 0

3 years ago

Read 2 more answers