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DiKsa [7]
4 years ago
10

Using cross multiply how to you find what x equals in number 8

Mathematics
2 answers:
kirill115 [55]4 years ago
8 0
8) 
(x-7)/5=(x-9)/2

do × multiply to get to the next step:

2(x-7)=5(x-9)

use the distribution method and then solve for x as below:

2x-14=5x-45

-14=3x-45

3x=45-14

3x=31

x=31/3


Mkey [24]4 years ago
6 0
Multiply each side by 5 and by 2 so you end up with:

2(x-7)=5(x-9)
2x-14=5x-45
2x-5x=-45+14
-3x=-31
x=10.333
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What is the sum of the first 7 terms of the series −4+8−16+32−... ?
pochemuha

we have that

−4+8−16+32−.....

a1=-2*(-2)-----> -4

a2=-4*(-2)-----> +8

a3=+8*(-2)-----> -16

a4=-16*(-2)----> +32

a5=+32*(-2)----> -64

a6=-64*(-2)-----> +128

a7=+128*(-2)-----> -256

The sum of the first 7 terms of the series is

<span>[a1+a2+a3+a4+a5+a6+a7]-----> [-4+8-16+32-64+128-256]-------> -172</span>

<span>
the answer is -172</span>
4 0
3 years ago
Write 8.18 × 10^–3 in standard notation.<br> A. 0.0818<br> B. 0.000818<br> C. 0.00818.<br> D. 0.818
elena-s [515]

I believe the answer to be C. You would move the decimal place over 3 to the left. Leaving it to be .00818 or 0.00818

8 0
3 years ago
6a+12=72 I need the steps please
Aleonysh [2.5K]

Answer: a = 10

Step-by-step explanation:    6a + 12 = 72

                                                       -12    -12

                                                6a = 60

                                                6a/6 = 60/6

                                                a = 10

8 0
3 years ago
Read 2 more answers
Brian is working his way through school. He works two part-time jobs for a total of 24 hours a week. Job A pays $5.80 per hour,
ra1l [238]

Answer:

10, 14

Step-by-step explanation:

A + B = 24, so A = 24 - B

5.8A + 7.4B = 161.6

Substitute the first equation into the second

5.8(24 - B) + 7.4B = 161.6

139.2 - 5.8B + 7.4B = 161.6

139.2 + 1.6B = 161.6

1.6B = 22.4

B = 14, So he works 14 hours at job B.

Together they make 24, so he works 10 hours at job A.

5 0
3 years ago
At a pizza shop, 70% of the customers order a pizza, 25% of the customers order a salad, and 15% of the customers order both a p
ArbitrLikvidat [17]

Answer:

The probability that a randomly selected customer orders a pizza or a salad is 80%

Step-by-step explanation:

Let's call

P_p = the proability of someone asking for a pizza

P_s = the probability that a customer orders a salad

Pp∩s = the probability that a customer orders a pizza and a salad.

We know from the statement of the problem that:

P_p = 70% = 0.7

P_s = 25% = 0.25

Pp∩s = 15% = 0.15

We want to know the probability that a randomly selected customer will order a pizza or a salad. Then, by set theory, that probability is calculated as:

Pp∪s = P_p ∪ P_s - Pp∩s

So:

Pp∪s = Pp + Ps - Pp∩s

 Where Pp∪e is the probability that the customer orders a pizza or a salad, but not both at the same time.

Pp∪e = 0.7 + 0.25 -0.15

Pp∪e = 0.8

Finally, the probability that a randomly selected customer orders a pizza or a salad is 80%

6 0
3 years ago
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