3 years ago

What is the first step to solving 9z-21=60

Mathematics

2 answers:

ELEN [110]3 years ago

7 0

Add 21 to both sides, so you get 9z = 81

MatroZZZ [7]3 years ago

6 0

Answer:

add 21 to both sides

Step-by-step explanation:

9z-21=60

9z-21+21 =60+21

9z=81

9z/9=81/9

z = 9

You might be interested in

Suppose that in a random selection of 100 colored candies, 26% of them are blue. The candy company claims that the percentage

quester [9]

Answer: a) -0.2252, b) 0.8219

Step-by-step explanation:

Since we have given that

Sample size n = 100

Probability that candies are blue = p= 0.26

Probability that company claims that it is blue candy = P = 0.27

So, Q = 1-P= 1-0.27 = 0.73

So, Null hypothesis : $H_0:p=P$

Alternate hypothesis : $H_1:p\neq P$

So, the test statistic would be

$z=\dfrac{p-P}{\sqrt{\dfrac{P.Q}{n}}}\\\\z=\dfrac{0.26-0.27}{\sqrt{\dfrac{0.27\times 0.73}{100}}}\\\\z=-0.2252$

Since α = 0.05

So, critical value of z = 1.96

p-value = P(Z>Z(calculated)

Using the excel function , we get that

$P(z>0.2252)\\\\=2\times 0.410.911845\\\\=0.8219$

Hence, a) -0.2252, b) 0.8219

6 0

3 years ago

Quelle est la hauteur de trapèze? <br> what is the height of trapezoid?

Triss [41]

Answer:

the hight is 3

Step-by-step explanation:

5 0

3 years ago

What is the equivalent of pi over 6 radians in degrees? (5 points) Group of answer choices 30 degrees 60 degrees 90 degrees 120

Blizzard [7]

Answer: 30°

Step-by-step explanation:

Trust me

5 0

4 years ago

Giovanni is visiting her grandmother who lives in an apartment building on the 25th floor. Giovanni enters the elevator in the l

Blizzard [7]

So how many does he have left

25-16=9
9 floors left

the want a percentage so 9 out of 25
percent is out of 100
a hack for this specific problem is that 25 is exactly 1/4 of 100 so
9/25 times 1=the same thing so
9/25 times 4/4 (simplifies to 1)=(9 times 4)/(25 times 4)
36/100
this is out of 100 so
36%

of course there is a legit way of solving this problem but this is a hack (this works for factors of 100 like 2,4,5,10,20,25,50)

5 0

3 years ago

Read 2 more answers

For the equation, 9x = 3y. Write an EQUATION describing y as a function of x

aleksandr82 [10.1K]

Answer: 9x + 3y = 12

Alternative forms: y = 0.4 OR y = $2/3^{2}$

6 0

3 years ago

What is the first step to solving 9z-21=60​

What is the first step to solving 9z-21=60