Two methods are proposed to measure the effectiveness of a brand of sunscreen,
Which statement is a correct interpretation of these
methods?
Method A: Survey adults visiting a beach on a busy
weekend. Ask each adult which brand of sunscreen
they are using, and assess their arms for sun
exposure.
Method B: Volunteers are randomly assigned to
one of two brands of sunscreen. Each volunteer is
asked to report back at the end of the day, and their
arms are assessed for sun exposure.
O Both methods are experiments because sun
exposure is assessed in both methods.
Both methods are observational studies because
neither method attempts to influence responses.
O Method A is an experiment because it compares
many brands of sunscreen, while method B is an
observational study
O Method B is an experiment because it randomly
assigns volunteers a sunscreen, while method A is
an observational study.

answer: c, the green line

step-by-step explanation:

there is no black line, eliminate b.

simple interest implies periodic payments, but the red line shows no payments, eliminate d.

simple interest has equal payments. if paid say every day, the graph is about a straight line (actually a stairstep).

the yellow line is not straight, eliminate a.

check: the green line is straight, answer is c.

simple interest with positive interest rate gives a straight line sloping up to the right. green line:

g(t) = $100 + ($200-$100) ÷ (20 years) × (t years)

= $100 + (4%/year) × ($100)(t years)

incidentally, the yellow line curving upward represents continuously compounded interest

y = $100 × 2^(t years / (14 assuming the yellow line hits $200 at 14 years. 2^0 is 1, so y(0) = $100; 2^(14/14) is 2, so y(14) = $200.

what are you trying to solve here

step-by-step explanation:

1st integer x

2nd integer x+1

3rd integer x+2

4th integer x+3

x+x+1 +x+2+x+3 =74

combine like terms

4x+6 = 74

subtract 6 from each side

4x = 68

x = 17

the integers are 17,18,19,20