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patriot [66]
2 years ago
7

If you were to use the substitution method to solve the following system, choose the

Mathematics
1 answer:
Nezavi [6.7K]2 years ago
7 0

Answer:

15x - y = - 6.....15x + 6 = y...so we sub in 15x + 6 in for y on the other equation

5x - 3y = -13

5x - 3(15x + 6) = -13 <== the new equation

Step-by-step explanation:

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Simplify (5+2i)(1-3i)
larisa86 [58]

Answer:

5-15i+2i-6(i^2)

-6(i^2)-13i+5

4 0
3 years ago
What times -1/2 x what = -20?
Radda [10]

Answer:

40

Step-by-step explanation:

Let the number be y

-1/2 × y = -20

y = -20 ÷ -1/2

y = 20 × 2

y = 40

6 0
2 years ago
Jaqleen can unload a grocery truck twice as fast as Marco. Together, they can unload the truck in 5 hours. How long would it tak
amm1812

Jaqleen unloads a truck in x hours and Marco takes 2x hours.

Working together (x*2x) / (x+2x) = 5 hours

2x^2 / 3x = 5  Multiplying both sides by 3x equals 2x^2 -15x = 0

x = 7.5 hours

So Jaqleen takes 7.5 hours and Marco takes 15 hours

Double-Check (7.5 * 15) / (7.5 + 15) = 112.5 / 22.5 equals

5 hours Correct!!


7 0
2 years ago
ANSWER ASAP! 1 question, explanation would be appreciated but not required!
IrinaK [193]

Answer:

choice 3) 50 in

Step-by-step explanation:

A = 625(Pi) in^2

radius = (sq rt 625)(Pi)/Pi

radius = 25

d = 2(radius)

d = 50 in

7 0
2 years ago
3(5-2x)=-4(cx+4)
ycow [4]

Answer:

c = 3/2

Step-by-step explanation:

hello :

3(5-2x)=-4(cx+4)

-6x+15 = - 4 cx-16

-6x+4cx = -16-15    means 6x-4cx=-31

(6-4c ) x = 31

the equation have no solutions when : 6-4c = 0   (you have : 0x=31...false)

-4c=-6

c= -6/-4

c = 3/2

7 0
3 years ago
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