Question

Can someone help me with 7 and 8

Answer 1

7)

$\frac{y}{2x}; if y=8,x=\frac{1}{4} \\\\\frac{8}{2*\frac{1}{4} } =\frac{8}{\frac{1}{2}} =8:\frac{1}{2} =8*2=16$

8)

$2(10-24x)+y^2; ify=8, x=\frac{1}{4} \\\\2(10-24*\frac{1}{4} )+8^2=2(10-6 )+8^2=\\=20-12+64=72$

9)

m-the number of months. So in 6 months the computer will be paid for

$25+10*6=25+60=85$

P.S. Hello from Russia

Answer 2

Step-by-step explanation:

$7) \: \frac{y}{2x} = \frac{8}{2 \times \frac{1}{4} } = \frac{8}{ \frac{1}{2} } = 8 \times 2 = 16 \\ \\ 8) \: 2(10 - 24x) + {y}^{2} \\ = 2(10 - 24 \times \frac{1}{4} ) + {8}^{2} \\ = 2(10 - 6) + 64 \\ = 2 \times 4 + 64 \\ = 8 + 64 \\ = 72$

9) Payment for m months = 25 + 10m

Hence, payment after 6 months

= 25+10*6 = 25 + 60 = 85

So, after 6 months you will have to pay $85 for your computer.