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velikii [3]
3 years ago
11

PLEASE HELP I WILL MARK BRAINLYEST. 50 POINTS PLEASE. I WILL REPORT ABSURD ANSWERS. MY QUESTIONS ARE THE IMAGES BELOW

Mathematics
1 answer:
Arturiano [62]3 years ago
3 0

Answer:

  • 1, 3, 4- yes, 2- no

Step-by-step explanation:

#1

  • Yes, it is function
  • x-values are unique and each has one corresponding y-value

#2

  • No, it is not a function
  • x-values are repeated with different y-value: (13, 4) and (13, -4)

#3

  • Yes, it is a function
  • If you put a vertical line, there will always be one intersection with the graph

#4

  • Yes, it is a function
  • This will produce a parabola which is a graph of a normal function with unique x-values and corresponding y-values
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Prove the following identity showing all steps:
kiruha [24]

Answer:

See solution below

Step-by-step explanation:

Given the expression

\frac{cos(x+30)-sin(x+60)}{sin(x)cos(x)} \\

Recall that

cos x  = sin(90-x)

cos(x+30 ) = sin (90-(x+30)

= sin(90-x-30)

= sin(60-x)

Substitute

\frac{sin(60-x)-sin(x+60)}{sin(x)cos(x)} \\= \frac{sin60cosx-cos60sinx)-sinxcos60-cosxsin60)}{sin(x)cos(x)} \\=  \frac{-2cos60sinx)}{sin(x)cos(x)} \\= \frac{-2(1/2)sinx)}{sin(x)cos(x)} \\= \frac{-1}{cos(x)}\\= \frac{1}{cos(x)}\\ \\= -sec(x) Proved

8 0
3 years ago
What is the measure of RST?​
kumpel [21]

Answer:

A. m\angle RST=62^{\circ}

Step-by-step explanation:

We have been given a diagram. We are asked to find the measure of angle RST.

We can see that angle RST is formed by intersecting chords inside the circle, so its measure would be half the sum of intercepted arcs as:

m\angle RST=\frac{\widehat{RT}+\widehat{PQ}}{2}

m\angle RST=\frac{77^{\circ}+47^{\circ}}{2}

m\angle RST=\frac{124^{\circ}}{2}

m\angle RST=62^{\circ}

Therefore, the measure of angle RST is 62 degrees.

6 0
4 years ago
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PLZ HELP!!!
crimeas [40]

Answer: 33

Step-by-step explanation:

33 kids in band

10 taking band + chorus

24 taking chorus

33+10+24=67

100-67=33

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4 years ago
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At least $73.50 for 7x3 is 21 gallons and 10.50x7 is $73.50
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