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Firdavs [7]
3 years ago
13

Blake simplified the expression (StartFraction x Superscript 12 Baseline Over x Superscript negative 3 Baseline EndFraction) Sup

erscript 5 to StartFraction 1 Over x Superscript 20 Baseline EndFraction. What was Blake’s mistake?
Mathematics
2 answers:
ziro4ka [17]3 years ago
9 0

Answer:

D on E2020. (Divided exponents instead of subtracting)

Step-by-step explanation:

elena-s [515]3 years ago
6 0

Answer:

D.

Step-by-step explanation:

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Given: A, B, and C What is the value of X in the matrix equation AX + B = C?
Ksju [112]

Answer:

Option (2)

Step-by-step explanation:

Given expression is, AX + B = C

A=\begin{bmatrix}-3 & -4\\ 1 & 0\end{bmatrix}

B=\begin{bmatrix}-7 & -9\\ 4 & -1\end{bmatrix}

C=\begin{bmatrix}-42 & -20\\ 5 & 4\end{bmatrix}

AX + B = C

AX = C - B

C - B = \begin{bmatrix}-42 & -20\\ 5 & 4\end{bmatrix}-\begin{bmatrix}-7 & -9\\ 4 & -1\end{bmatrix} = \begin{bmatrix}-42+7 & -20+9\\ 5-4 & 4+1\end{bmatrix}

C - B = \begin{bmatrix}-35 & -11\\ 1 & 5\end{bmatrix}

Let  X=\begin{bmatrix}a & b\\ c & d\end{bmatrix}

AX = \begin{bmatrix}-3 & -4\\ 1 & 0\end{bmatrix}\times \begin{bmatrix}a & b\\ c & d\end{bmatrix}

     = \begin{bmatrix}(-3a-4c) & (-3b-4d)\\ a & b\end{bmatrix}

Since AX = C - B

\begin{bmatrix}(-3a-4c) & (-3b-4d)\\ a & b\end{bmatrix}=\begin{bmatrix}-35 & -11\\ 1 & 5\end{bmatrix}

Therefore, a = 1, b = 5

(-3a - 4c) = -35

3(1) + 4c = 35

3 + 4c = 35

4c = 32

c = 8

And (-3b - 4d) = -11

3(5) + 4d = 11

4d = -4

d = -1

Therefore, Option (2). X = \begin{bmatrix}1 & 5\\ 8 & -1\end{bmatrix} will be the answer.

7 0
3 years ago
Is 15 over 45 equivalent to 45 over 135
faltersainse [42]
Yes, in simplest form, both fractions are 1/3 (one over three)
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3 years ago
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barxatty [35]
C is your answer i hope u got it right
5 0
3 years ago
A 22-foot ladder is leaning up against the side of a house. The ladder makes an angle of 77o with the ground. How far up the sid
Crank

Answer:

21.44 ft

Step-by-step explanation:

(sketch to understand)

use SOH/CAH/TOA rules to solve

sin rule is used

solve for x

(working in the picture attached)

8 0
2 years ago
1. "Fasting blood sugar" is a lab test usually done six to eight hours after eating. The normal range for this test is 70
Ilya [14]

Answer:

1. "Fasting blood sugar" is a lab test usually done six to eight hours after eating. The normal range for this test is 70

Step-by-step explanation:

6 0
3 years ago
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