−5.2 + y = 7.5

Mathematics

2 answers:

klio [65]3 years ago

5 0

Answer:

your answer is

d. y = 12.7

lbvjy [14]3 years ago

5 0

Answer:

D) 12.7

Step-by-step explanation:

$y -5 . 2 = 7 . 5$

$y - 5 . 2 + 5 .2 = 7 . 5 + 5 . 2$

$y=12.7$

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Step-by-step explanation:

$a_n=48,\ a_1=1875\ r=\dfrac{2}{5}\\\\a_n=a_1 \cdot r^{n-1}\\\\48=1875\cdot \bigg(\dfrac{2}{5}\bigg)^{n-1}\\\\\dfrac{48}{1875}=\bigg(\dfrac{2}{5}\bigg)^{n-1}\\\\\dfrac{16}{625}=\bigg(\dfrac{2}{5}\bigg)^{n-1}}\\\\\bigg(\dfrac{2}{5}\bigg)^4=\bigg(\dfrac{2}{5}\bigg)^{n-1}}\\\\4=n-1\\\\\large\boxed{5}=n$