Ella builds a rectangular sandcastle with a length of 41 inches and a width of 32 inches. What is the perimeter of her sandcastle?

Step-by-step explanation:

Given

The dimension of the rectangular sandcastle is

length

width

Perimeter is the sum of the sides of rectangle

h(t) = 210 – 15t models the altitude of a hot air balloon over time t, in minutes

means that at time t min, the height h of the balloon is 210-15t     (units)

for example,

at time t=1 min, the height of the balloon is 210-15*1=195 (units)

at time t=2 min, the height of the balloon is 210-15*2=210-30=180   (units)

thus, h(10) is the height of the balloon at time t=10 min,

h(10)=210-15*10=210-150=60

step-by-step explanation: