Stuck on this ∠abc is adjacent to ∠cbd. if the m∠abc=4x+23, m∠cbd=6x+7, and m∠abd=130°, what is the measure of angle abc?

In the given figure ar(adf) =ar(cda) and ar(cdf) = ar(cdf). show that abdc and cdfe are trapeziums.

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4