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tangare [24]
3 years ago
15

Find the number, if the sum of 9 and a half a number equals 35. Which of the following translations is correct?

Mathematics
2 answers:
lianna [129]3 years ago
8 0
Let's translate “ the sum of 9 and a half a number equals 35 " into an equation which is:
9+1/2x=35
Or
9+x÷2=35
Solve:
9+1/2x=35
Subtract 9 to each side
9+1/2x-9=35-9
1/2x=26
Multiply 2 to each side
1/2x*2=26*2
x=52
It
9+x÷2=35
Subtract 9 to each side
9+x÷2-9=35-9
x÷2=26
Multiply 2 to each side
x÷2*2=26*2
x=52. As a result, the correct choices are 9+x÷2=35. Hope it help!
Alla [95]3 years ago
6 0
I think its the first choice
9+1/2x=35 is the original equation if you translate the words, but 9+x divided by 2=35 is equivalent
hope this helps!
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yarga [219]

Because this is a fourth degree that will be tricky to factor as it is, we will do a u substitution. Let x^2=u. We can now rewrite that polynomial in terms of u: u^2-7u-8=0. Filling into the quadratic formula we have u=\frac{7+/-\sqrt{49-4(1)(-8)}}{2}. Simplifying down u=\frac{7+/-\sqrt{81}}{2} and u=\frac{7+9}{2} or u=\frac{7-9}{2}. That means that u = 8 or u = -1. But don't forget that we let u=x^2, so we have to put x-squared back in for u. That gives us x^2=8 which simplifies down to +/-2\sqrt{2}. That also gives us x^2=-1. When we take the square root of -1, we have to use the fact that -1 = i^2, so we sub that in to get x=+/-i. All in all, your solutions are as follows: 2\sqrt{2},-2\sqrt{2},i,-i which is choice b.

7 0
3 years ago
jeanine Baker makes floral arrangements. She has 13 different cut flowers and plans to use 7 of them. How many different selecti
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A total of 1,716 selections of the 7 flowers are possible.

Step-by-step explanation:

Step 1:

There are 13 flowers from which Jeanine Baker plans to use 7 of them.

To determine the number of selections that are possible we use combinations.

The formula for combinations is; ^{n} C_{r}=\frac{n !}{(n-r) ! r !}.

Step 2:

In the given formula, n is the total number of options and r is the number of options to be selected.

For this question, n = 13 and r=7.

So ^{13} C_{7}=\frac{13 !}{(13-7) ! 7 !} = \frac{13 !}{(6) ! 7 !} = 1,716.

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Answer:

D2=21/24 mile

Step-by-step explanation:

Her it is not specified if it is base or height, it only talks about dimensions, so let's work with dimensions

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D1=4/21mile, D2=?

Area of a triangle A=\frac{b.h}{2}

A=((D1*D2)/2) → 2A=D1*D2 → D2=2A/D1 so D2=(2*1/12)/(4/21) =(1/6)/(4/21) = (1*21)/(6*4)=21/24 mile

7 0
3 years ago
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