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3 years ago

I whats the answer????

Mathematics

2 answers:

dem82 [27]3 years ago

8 0

Answer:

The equations that are true are

Step-by-step explanation:

A) States that 0 + 451 = 0, but that is not true because...

0 + 451 = 451

B) States that 130 + 210 = 210 + 130, and that is true because...

130 + 210 = 210 + 130

340 = 340

C) States that (127 + 80) + 250 = 127 + (80 + 250), and it is true because...

(127 + 80) + 250 = 127 + (80 + 250)

127 + 80 + 250 = 127 + 80 + 250

457 = 457

D) States that (123 + 57) + 180 = 153 + (87 + 180), but that is not true because...

(123 + 57) + 180 = 153 + (87 + 180)

123 + 57 + 180 = 153 + 87 + 180

360 = 420 (but this does not make sence)

E) States that 497 + 0 = 497, and it is true because...

497 + 0 = 497

497 = 497

nika2105 [10]3 years ago

6 0

Answer:

E is true, B is true, C is true,

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3 years ago

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Step-by-step explanation:

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3 years ago

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OleMash [197]

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Phyllis invested 50000 dollars, a portion earning a simple interest rate of 5 percent per year and the rest earning a rate of 7

Elodia [21]

Answer:

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Step-by-step explanation:

we know that

The simple interest formula is equal to

$I=P(rt)$

where

I is the Final Interest Value

P is the Principal amount of money to be invested

r is the rate of interest

t is Number of Time Periods

Let

x-----> the amount invested at 5%

50,000-x -----> the amount invested at 7%

$t=1\ year\\ I=\$2,720\\r_1=0.05\\r_2=0.07\\P_1=\$x\\P_2=\$(50,000-x)$

substitute in the formula above

$2,720=x(0.05*1)+(50,000-x)(0.07*1)$

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$(50,000-x)=\$11,000$

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