I need help please . Even True and False questions explanation is required. 10:2

Question

I need help please .
Even True and False questions explanation is required. 10:23 AM 73% ....o mobily 1. The equation of the line with slope and y-intercept A. True B. False 2. Using the formula of Simple interest, if R P-S 13 years then r 0.31% A. True B. False 3. The solution of s 19 is a A. True B. False 4. The domain of the function ruo- is A. True B. False 5. A recording company produces compact disk (CDs. One- time fixed costs for a particular CD are S24,000; this includes costs such as recording, album design, and promotion. Variable costs amount to S6.20 per CD and include the manufacturing, distribution, and royalty costs for each disk actually manufactured and sold to a retailer. The CD is sold to retail outlets at S8.70 each. How many CDs must be manufactured and sold for the company to break even? 6. Find the equation of the line through the points -5,7 and (4,16) 7. The price-demand function for a company is given by where x represents the number of items and P(x) represents the price of the item. Determine the revenue function and find the revenue generated if 50 items are sold. 8. Find the co-ordinates of the vertex for the quadratic function fu)-2 .2. 22 9. A loan of S4000 was repaid at the end of 9 months with a check of S4300. Using the simple interest formula, calculate the annual rate of interest charged. A. 14% B 20% C. 15% D. 10% E. 3% 10. If S 30000 is invested into a fund with interest rate r-5 what is the amount after 8 years if A, the amount is compounded monthly B. the amount is compounded continuously

Explanation / Answer

(1) We know the equation of tangent with slope m is

y=mx+b

here slope =m=-3    and y intercept=b=1/3

therfore equation is y=-3x+1/3,   but given equation have y=3x+1/3

so, false B

(2)we know I=Prt/100

=> r=100*I/(P*t)=100*28/(700*13)=4/13=0.31% (A) True

(3)7x+5>19

=>   7x>19-5

=>    7x>14

=> x>2 but given x>1 hence false(B)

(4)f(x)=sqrtx

since square root is defined only for non negative values

hence domain is x>=0   but given is x>0

Hence false (B)

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