MATHEMATICS HIGH SCHOOL

Juan earns 52 dollars per weekworking part-time at a book store.
He makes one dollar more for each
book that he sells. The amount, A
(in dollars), that Juan
earns in a week if he sells b books
is given by the following.

A=52 + b

How much does Juan earn in a
week if he sells 37 books?

Answers

Answer 1

Answer:

Answer:

the answer is 89

Step-by-step explanation:

52 plus 37 = 89

Answer 2

Answer:

Answer:

89 books

Step-by-step explanation:

he sells 37 books so we do 52+37 and get 89

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How to decrease £64 by 70%

Answers

you can do it in two ways,

1st method,

64×70=4480
4480÷44.8
64-44.8=19.2

2nd method,
you have to find the common multiplier,
to find the common multiplier you have to decrease the percentage by 100 and divide it by 100,

100-70=30
30÷100=0.3

now you have to multiply 0.3 and 64,

0.3×64=19.2

either way, you'll get the answer, 19.2
hope this helps....

Solve.

$√(x-1)+3=x$

Answers

$√(x-1)+3=x;\ Domain:x-1\geq0\ \wedge\ x\geq3\to x\geq1\ \wedge\ x\geq3\nD:x\in[3;\ \infty)\n\n√(x-1)=x-3\ \ \ \ |square\ both\ sides\n\nx-1=(x-3)^2\ \ \ \ |use\ of\ the\ formula:(a-b)^2=a^2-2ab+b^2\n\nx-1=x^2-6x+9\n\nx^2-6x+9=x-1\n\nx^2-6x-x+9+1=0\nx^2-7x+10=0\ \ \ \ |use\ quadratic\ formula$

$a=1;\ b=-7;\ c=10\n\n\Delta=b^2-4ac\to\Delta=(-7)^2-4\cdot1\cdot10=49-40=9\n\nx_1=(-b-\sqrt\Delta)/(2a);\ x_2=(-b+\sqrt\Delta)/(2a)\n\n\sqrt\Delta=\sqrt9=3\n\nx_1=(7-3)/(2\cdot1)=(4)/(2)=2\notin D\n\nx_2=(7+3)/(2\cdot1)=(10)/(2)=5\in D\n\nSolution:x=5$

$√(x-1)+3=x\n √(x-1)=x-3\n D:x-1\geq0 \wedge x-3\geq0\n D:x\geq1 \wedge x\geq3\n D:x\geq3\n x-1=(x-3)^2\n x-1=x^2-6x+9\n x^2-7x+10=0\n x^2-2x-5x+10=0\n x(x-2)-5(x-2)=0\n (x-5)(x-2)=0\n x=5 \vee x=2\n 2\not \in D \Rightarrow x=5$

Dr.Sox paid $1580 for a new computer system. She also paid a 6.5 sales tax. How much was the tax? What was the total cost?

Answers

Total cost $1682.70
Tax = 102.70

1580 x 6.5% = 102.70

i believe the answer to this question is 10270 sorry if it is inccorect

Cheryl went on a 3-hour train ride. The train traveled at an average speed of 75 miles per hour. What was the total distance in miles that Cheryl traveled?A)225
B)215
C)25
D)72