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3 years ago

Evaluate cos 90°. Round your answer to the nearest hundredth if necessary

Mathematics

1 answer:

ivann1987 [24]3 years ago

5 0

Cos(90)= 0.00

It is only zero

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What is the product of (2x-7) and (3x + 3)?

eduard

<h3>✒️EVALUATION </h3>

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$\large\sf\underline{Problem:}$

What is the product of (2x-7) and (3x + 3)?

A. 6x2 + 15x-21
B. 6x2 - 15x - 21
C. 6x2 + 15x + 21
D. 6x2 - 15x + 21

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$\large\sf\underline{Answer:}$

$\qquad \qquad \huge \rm Letter\:B.$

*Please read and understand my solution. Don't just rely on my direct answer*

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$\large\sf\underline{Solution:}$

Here we have the given choices:

A. 6x2 + 15x-21
B. 6x2 - 15x - 21
C. 6x2 + 15x + 21
D. 6x2 - 15x + 21

Solve this equation using the distributive property,where you multiply each term to get the number.

$\begin{gathered} \rm2x - 7 = \boxed{ 6} \: \bigg| \small\boxed{\: 6 {x}^{2} } \\ \rm (7)(3) = \boxed{21} \bigg | \boxed{\: 21 x} \\ \\ \qquad \rm6x^{2}+(6x- 21x)-21 \\ \qquad \boxed{ \rm6 {x}^{2} + 15x - 21}\end{gathered}$

Therefore, the correct option is letter B.

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3 0

2 years ago

0x + 8 = 5x - 3 What is X?

Gennadij [26K]

Answer:

x= 11/5 OR 2.2

Step-by-step explanation:

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3 years ago

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For z = –2 + 2i, which graph represents z and –2z?

iVinArrow [24]

Answer:

Graph B

Step-by-step explanation:

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3 years ago

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Simplify the following expression 4/1/4-5/2

lorasvet [3.4K]

Answer:

$1\frac{3}{4}$

Step-by-step explanation:

$4 \frac{1}{4} - \frac{5}{2}$ = $1 \frac{3}{4}$

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2 years ago

MARKING AS BRAINLIEST!! Starr if given functions are inverse)!

Kitty [74]

Answer: They are inverses of each other

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Explanation:

We'll need to compute h(f(x)) and f(h(x)) to see if we get x each time.

$h(x) = 9x-4\\\\h(f(x)) = 9(f(x))-4\\\\h(f(x)) = 9\left(\frac{x+4}{9}\right)-4\\\\h(f(x)) = x+4-4\\\\h(f(x)) = x\\\\$

and,

$f(x) = \frac{x+4}{9}\\\\f(h(x)) = \frac{h(x)+4}{9}\\\\f(h(x)) = \frac{9x-4+4}{9}\\\\f(h(x)) = \frac{9x}{9}\\\\f(h(x)) = x\\\\$

Both composite functions lead to x each time.

The equations h(f(x)) = x and f(h(x)) = x being true means each function is the inverse of the other.

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3 years ago

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