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In-s [12.5K]
3 years ago
7

What is the value of x in the equation 2x + 9 = 21? (4 points)

Mathematics
1 answer:
Triss [41]3 years ago
8 0

answer=2x=12,x=6

2z+4=0,z=-2

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Is this right yes or no?​
valkas [14]

Answer:

Looks good to me, ur smort (I'm trying to rank up, brainlist pls)

It might be D tho so watch out

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Which points are on a plane curve described by the following set of parametric equations?
Vlad1618 [11]

ANSWER

The points (1,2) and (7,2) lie on the given curve.

EXPLANATION

The given parametric equations are:

x = 3t + 4

and

y = 2 {t}^{2}

We make t the subject in the first equation to obtain:

t =  \frac{x - 4}{3}

We substitute this into the second equation to get:

y =2{(\frac{x - 4}{3} )}^{2}

When x=1,

y = 2 {(\frac{1 - 4}{3} )}^{2}  = 2

When x=2

y =2{(\frac{2- 4}{3} )}^{2}  =  \frac{8}{9}

When x=7,

y =2{(\frac{7 - 4}{3} )}^{2}  = 2

Therefore the points (1,2) and (7,2) lie on the given curve.

8 0
3 years ago
The program director at a botanical garden surveyed 75 of their annual members about the number of times they visit the gardens
Tatiana [17]

Answer: C) 165 annual members

Step-by-step explanation:

Those who will visit the garden more than 3 times in the next month will be those who visit 4, 5, and 6 or more times.

Out of the 75 surveyed, the total number of those are:

= 9 + 12 + 3

= 24

That would give a percentage of:

= 24 / 75

= 32%

This means that the best estimate for those who will visit more than 3 times is 32%.

Out of the total number of 516, that is:

= 32% * 516

= 165 members

6 0
3 years ago
Solve the system by substitution.<br> y=4x+3<br> y=7x
Wewaii [24]

Answer:

(1, 7)

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Help me please,Thanks
Lubov Fominskaja [6]
I think the answer is 4 because you have to count all the numbers before the 3rd marking. Also count the actual 3rd marking.
6 0
3 years ago
Read 2 more answers
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