Mrs. johnson spend $611 buying lunch for 78 students. if all lunches cost the same, about how much did she spend on each lunch

$35.96 to 2.d.p. or 36 to 2.s.f.

Step-by-step explanation:

We can show this by:

611 = 78x

x being the 78 students

To find 1x which is the price of one student, or one lunch, we can simply divide both sides by 78:

Or:

35.95 = 1x

So each lunch cost 35.96 to 2.d.p. or 36 to 2.s.f.

13

step-by-step explanation:

169-1=168

168-3=165

165-5=160

160-7=153

153-9=144

144-11=133

133-13=120

120-15=105

105-17=88

88-19=69

69-21=48

48-23=25

25-25=0

since it took 13times to completely subtract it hence its square root is 13

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a