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3 years ago

Type the correct answer in the box. If necessary, use / for the fraction bar and simplify the fraction. cos(75°)cos(15°) =

Mathematics

2 answers:

diamong [38]3 years ago

5 0

Answer:

1/4

Step-by-step explanation:

using the product-to sum formulas, this is

1/2 (cos(75+15) + cos(75-15))

Vikki [24]3 years ago

3 0

Answer:

1/4

Step-by-step explanation:

PLATO USER

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jeka94

Answer:

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3 years ago

Alan is giving a basic math test in his class. One of the questions in the test is about finding two factors of the number 221.

NARA [144]

Answer:

★ The two factors of the number 221 are 13 and 17.

A factor refers to a whole number, which fits evenly into another whole number. Thus, factors are the numbers, which we multiply together to get another number. The two numbers that can be multiply together to get 221 are 13 and 17.

Step-by-step explanation:

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3 years ago

Solve the system of equations using matrices. x+7y=02x−8y=22 Question 7 (Mandatory) (1 point) Step 1. Find the coefficient matri

Alex Ar [27]

Answer:

x=7

y =-1

Step-by-step explanation:

Given is a system of equations in x and y as

$x+7y=0\\2x-8y =22$

This can be written in matrix form as

Ax = B

$\left[\begin{array}{ccc}1&7\\2&-8\end{array}\right]\left[\begin{array}{ccc}x\\y\end{array}\right] =\left[\begin{array}{ccc}0\\22\end{array}\right]$

Let us find inverse of A

$|A| = -8-14 =-22$

$A^{-1} =\frac{-1}{22} *\left[\begin{array}{ccc}-8&-7\\-2&1\end{array}\right]$

X= A ^(-1) B

x=7, y =-1

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3 years ago